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Metering mode

Metering mode refers to the method by which a digital or film camera measures the intensity of light in a scene to calculate the appropriate exposure settings, such as shutter speed, aperture, and ISO sensitivity, ensuring the image is neither too dark nor too bright. This built-in system, which has evolved from early handheld light meters used by photographers, relies on sensors within the camera to analyze reflected light from the subject and environment. By selecting different metering modes, photographers can prioritize specific areas of the frame—such as the entire scene, the center, a small spot, or bright highlights—to achieve accurate exposures in varied lighting conditions, from evenly lit landscapes to high-contrast backlit portraits. The most common metering modes include matrix (or evaluative) metering, center-weighted metering, spot metering, and highlight-weighted metering, each designed for particular photographic scenarios. Matrix metering, often the default setting on modern cameras, divides the frame into multiple zones (such as 420 or 1,005 segments) and uses advanced algorithms to evaluate overall light distribution, contrast, color, and subject distance—drawing from a database of thousands of reference images—to produce balanced exposures suitable for general use like landscapes or portraits. In contrast, center-weighted metering assigns 60-75% of its measurement to the central portion of the frame while de-emphasizing the edges, making it ideal for compositions where the main subject is positioned in the middle, such as traditional portraits against brighter backgrounds. Spot metering provides the most precise control by measuring light from a very small area, typically 1-5% of the viewfinder or a 1.5mm circle around the selected focus point, which is particularly useful for isolating exposure on small or distant subjects like wildlife or the moon in a dark sky. Highlight-weighted metering, a more recent addition in select cameras, prioritizes the brightest parts of the scene to prevent overexposure and preserve detail in highlights, proving effective for concerts, theater performances, or any situation with strong light sources like spotlights. These modes are typically selected via camera menus or dedicated buttons, and their effectiveness depends on the photographer's understanding of the scene's lighting dynamics, often in combination with exposure compensation to fine-tune results.

Fundamentals

Definition and Purpose

Metering mode refers to the method by which a camera evaluates the intensity of light in a scene to calculate proper exposure settings, including shutter speed, aperture, and ISO. This process involves measuring reflected or incident light to determine the appropriate combination of parameters that will produce a well-exposed image. The primary purpose of metering modes is to ensure balanced exposure across the image, avoiding overexposure in bright areas or underexposure in shadows, and adapting to diverse lighting conditions such as backlighting or high-contrast scenes. By providing accurate light readings, metering helps photographers achieve consistent results without relying solely on trial and error. At its core, a camera's metering system utilizes photometers or dedicated sensors, such as silicon photodiodes or multi-pixel RGB+IR arrays, to convert light into electrical signals that the camera's processor can analyze. These components enable precise measurement of scene luminance, forming the foundation for exposure computation. In automatic exposure modes, such as aperture priority or shutter priority, metering directly informs the camera's algorithms to adjust the uncontrolled parameters for optimal exposure, while in manual mode, it offers real-time guidance for photographer adjustments. This integration influences the exposure triangle—shutter speed, aperture, and ISO—to balance image brightness effectively.

Exposure Principles

Metering in photography primarily relies on reflected light metering, where the camera's sensor measures the light intensity bouncing off the subject toward the lens, assuming an average scene reflectance to determine proper exposure. This approach contrasts with incident light metering, which is less common in built-in camera systems and instead measures the light falling directly on the subject using a handheld device with a diffuser, providing a more direct assessment of illumination independent of subject reflectivity. Reflected metering systems are calibrated to render a standard middle gray surface—typically 18% reflectance—as the midtone in the exposure, ensuring balanced reproduction of tones in typical scenes. The core of exposure calculation in metering is encapsulated by the exposure value (EV) formula, which quantifies the combination of aperture and shutter speed for a given light level: \text{EV} = \log_2 \left( \frac{N^2}{t} \right) Here, N represents the f-number (aperture diameter relative to focal length), and t is the shutter speed in seconds; the logarithmic base-2 scaling reflects the doubling or halving of light in stops, allowing metering to balance these parameters to achieve the target exposure for middle gray. This equation underpins how metering algorithms adjust settings to maintain consistent exposure across varying light conditions, prioritizing midtones to avoid underexposure or overexposure in the final image. Modern camera sensors exhibit a dynamic range of approximately 12 to 14 stops, representing the luminance span from the darkest recoverable shadows to the brightest highlights without clipping or excessive noise, yet metering systems often prioritize midtones to fit this range effectively within the sensor's capabilities. In scenes with high contrast exceeding the sensor's dynamic range, metering evaluates the overall luminance distribution to shift exposure toward midtones, preserving detail in key areas while accepting potential loss in extremes. Camera sensors, typically based on silicon photodiodes, respond linearly to incident light intensity—output voltage proportional to photon flux—before analog-to-digital conversion (ADC) quantizes this signal into discrete digital values, with metering accuracy depending on the ADC's bit depth (e.g., 12-14 bits) to minimize quantization noise across the linear response curve. Logarithmic response sensors, which compress dynamic range to mimic human vision, are rare in standard photography cameras and not typically used in metering due to their non-linear output complicating precise exposure calculations. The linear detection followed by ADC ensures that metering can reliably map scene light levels to exposure settings, though accuracy diminishes in low-light conditions where noise impacts the signal.

Historical Development

Early Metering Systems

The development of early metering systems in photography began with handheld exposure meters in the 1930s, marking a shift from subjective estimation to objective light measurement. The Weston Model 617, introduced in 1932 by the Weston Electrical Instrument Corporation, was the first commercially available photoelectric light meter, utilizing a selenium photovoltaic cell to generate current proportional to light intensity, which drove a needle-based analog readout for exposure values. These selenium cells were self-powered by light, eliminating the need for batteries, but they suffered from limited sensitivity in low-light conditions and eventual degradation over time due to oxidation. Integration of metering into film cameras accelerated in the post-World War II era, with built-in meters appearing in single-lens reflex (SLR) designs by the early 1960s. The Minolta SR-7, released in 1962, was among the first 35mm SLRs to incorporate a built-in cadmium sulfide (CdS) cell meter, which offered greater sensitivity to low light levels compared to selenium, enabling more reliable readings in varied conditions. The Asahi Pentax Spotmatic, launched in 1964, further popularized this technology with its CdS-based system providing average metering across the scene, though it required stop-down metering where the photographer manually stopped down the lens to take readings. A pivotal advancement came with the introduction of through-the-lens (TTL) metering in the 1960s, which measured light passing through the camera lens to eliminate parallax errors inherent in external or off-lens meters. The Topcon RE Super, introduced in 1963, was the first 35mm SLR to feature TTL metering using a CdS cell positioned behind a partially silvered mirror, allowing accurate exposure assessment at full aperture without manual intervention. Despite these innovations, early systems were limited to non-zone-specific metering, averaging light across the entire scene and necessitating manual adjustments via rules like the Sunny 16 rule—which posits that on a sunny day, an exposure of f/16 at a shutter speed reciprocal to the film's ISO yields correct results—for precise control in non-ideal lighting.

Evolution in Digital Era

The transition to digital imaging in the late 1990s marked a pivotal shift in metering technology, as charge-coupled device (CCD) and complementary metal-oxide-semiconductor (CMOS) sensors enabled more precise, real-time light measurement integrated directly with image capture. Early digital single-lens reflex (DSLR) cameras, such as the Nikon D1 released in 1999, incorporated dedicated RGB sensors for through-the-lens metering, allowing for scene analysis during exposure without relying on film-based off-the-film systems. This integration facilitated immediate feedback and adjustments, contrasting with the post-exposure metering of analog predecessors. By the early 2000s, algorithmic advancements in evaluative and matrix metering leveraged digital processing to analyze hundreds to thousands of zones across the frame, incorporating color, luminance, and distance data for enhanced scene recognition. The Canon EOS D30, introduced in 2000 as Canon's first consumer DSLR with a CMOS sensor, featured a 35-zone evaluative metering system linked to focusing points, enabling the camera to weigh exposure based on subject position and lighting patterns in real time. Similarly, Nikon's 3D Color Matrix Metering, first implemented in digital form with the D1 using a 1,005-pixel RGB sensor, evolved through the decade to include finer zone divisions and pattern matching against pre-programmed scenes. Post-2010 developments introduced artificial intelligence (AI) and machine learning to metering, prioritizing dynamic subjects through features like face and eye detection, which dynamically adjust exposure weights in multi-zone systems. In mirrorless cameras, such as the Sony α1 launched in 2021, real-time tracking employs AI-based subject recognition to maintain metering focus on moving elements like humans or animals, integrating 1,200-zone metering with predictive algorithms for continuous exposure correction during bursts. Standardization efforts, such as ISO 12232 first published in 1998 and revised in 2006 and 2019, provided frameworks for digital exposure metrics, defining methods to calculate standard output sensitivity and recommended exposure index values that account for sensor noise and RAW file headroom—factors absent in film standards. This allowed manufacturers to calibrate metering algorithms consistently across devices, ensuring reproducible exposure results in digital workflows.

Types of Metering Modes

Spot Metering

Spot metering is a precise exposure measurement technique that evaluates light intensity from a very small portion of the scene, typically covering 1 to 5% of the frame, to determine the optimal camera settings. This method focuses on a narrow central area or one linked to the active autofocus point, calculating exposure based solely on that spot while disregarding the surrounding light. It assumes the metered area reflects middle gray (approximately 18% reflectance), adjusting shutter speed, aperture, and ISO accordingly to render that spot as neutral gray in the final image. This mode excels in high-contrast scenarios where the subject requires selective exposure control, such as a portrait subject against a bright sky or a backlit figure like a bride in sunlight, ensuring the key element is properly exposed without influence from the brighter or darker surroundings. For instance, photographers can meter directly on the subject's face to achieve accurate skin tones, ignoring overexposed backgrounds. Unlike broader modes such as center-weighted metering, which average a larger central zone with peripheral input, spot metering provides targeted precision for isolated elements. The primary advantage of spot metering lies in its high accuracy for critical exposure decisions in challenging lighting, enabling photographers to prioritize specific subjects effectively. However, it carries the risk of incorrect readings if the spot is misaimed, such as on specular highlights that could lead to underexposure of the overall scene or shadows causing overexposure. In implementation, the metering circle often measures 2 to 4 mm in diameter on full-frame sensors, equivalent to about 1.5 to 3.1% coverage depending on the camera model, and can be selected via the camera's menu or button for real-time adjustments.

Center-Weighted Metering

Center-weighted metering is a exposure metering mode in cameras that assigns a disproportionate emphasis to the light intensity in the central portion of the frame, typically allocating 60-80% of the total sensitivity to a central circle—often around 10-12 mm in diameter for 35mm full-frame equivalents—while distributing the remaining weight more gradually to the surrounding areas, creating a tapering effect toward the edges. This approach, sometimes referred to as the classic "60/40" bias, integrates readings from the entire scene but prioritizes the center to achieve a balanced exposure that favors the primary subject location in most compositions. This mode is particularly suited for general portraiture and scenarios where the main subject is positioned centrally in the frame, as it handles moderate contrast ratios effectively by ensuring the subject's exposure is accurate without being overly influenced by brighter or darker peripheral elements. For instance, it performs well in backlit portraits, where the subject's face in the center receives proper exposure even if the background sky risks overexposure. Among its advantages, center-weighted metering offers a forgiving balance for compositions where subjects are roughly centered, providing more reliable results than pinpoint modes in varied lighting without ignoring the frame's edges entirely, thus reducing the need for frequent exposure compensation in everyday shooting. However, it can lead to underexposure of darker edges or overexposure of bright peripheries in high-contrast backlit scenes, potentially requiring manual adjustments for evenly lit or off-center subjects. Variants of center-weighted metering exist across manufacturers, allowing user adjustments to the central area's size or weighting for customization; for example, Nikon cameras typically apply 75% weight to a selectable central circle of 8 mm, 12 mm, 15 mm, or 20 mm diameter (on full-frame models), while Canon EOS models emphasize the central area with a large percentage of sensitivity but without a specified weighting. Sony implementations emphasize the central region within an average of the full screen, suitable for centered subjects in general photography.

Average Metering

Average metering, also known as full-frame average metering, evaluates the luminance across the entire image frame uniformly, without applying any weighting to specific areas, to compute the overall exposure. The camera's meter integrates the light reflected from all parts of the scene and adjusts the exposure settings to render this average tone as middle gray, calibrated to approximately 18% reflectance, ensuring the total dynamic range fits within the medium's capabilities. This mode is best suited for evenly lit landscapes or studio setups with low contrast, where the scene's tones are relatively balanced and no dominant bright or dark areas skew the reading. Its primary advantages lie in its simplicity and reliability for uniform lighting conditions, providing consistent results without the need for manual adjustments in straightforward scenarios. A key disadvantage arises in high-contrast scenes, such as snowy landscapes, where the meter averages the bright whites with any shadows, causing the snow to appear as middle gray rather than white, often requiring positive exposure compensation to correct. Prior to the 1970s, average metering dominated early photoelectric exposure meters and built-in camera systems, offering a basic yet effective approach for film photography; though largely supplanted by weighted modes, it persists in entry-level cameras and acts as a foundational reference for more complex metering algorithms.

Partial Metering

Partial metering is an exposure metering mode in digital cameras that evaluates light intensity exclusively within a defined central region of the frame, typically encompassing 8-15% of the total viewfinder area, while disregarding all light from the surrounding periphery. This selective approach uses a circular or oval zone centered on the frame, often around 6.2% in Canon EOS models, to compute exposure settings based solely on that isolated portion. Unlike broader modes, it applies no weighting to outer areas, ensuring the metered value reflects only the targeted central subject without peripheral interference. This mode is particularly suited for scenarios involving high-contrast lighting, such as backlit portraits where the subject is positioned centrally against a much brighter background, or wildlife photography featuring animals against expansive skies, where full-frame averaging would overexpose the foreground. In these cases, partial metering prioritizes accurate subject exposure by excluding distracting bright or dark edges that could skew the overall reading. The primary advantages of partial metering lie in its ability to deliver precise control over subject illumination while incorporating slightly more contextual light than narrower alternatives, thus balancing detail retention with reduced risk of clipped highlights in the main area of interest. However, its complete exclusion of frame edges can result in suboptimal overall scene balance, especially in compositions where peripheral elements contribute significantly to the intended exposure or when subjects are off-center. In comparison to spot metering, which limits measurement to 1-5% of the frame for pinpoint accuracy, partial metering expands the coverage to provide additional surrounding context at the expense of some fine-tuned precision. It differs from center-weighted metering by sharply cutting off outer contributions rather than gradually tapering them, offering cleaner isolation of the central zone. On APS-C sensors, the effective coverage radius for this zone generally falls between 8-10 mm, scaling with sensor size in full-frame implementations.

Multi-Zone Metering

Multi-zone metering, also referred to as evaluative or matrix metering, employs a sophisticated computational approach to assess exposure across the entire image frame by segmenting it into numerous discrete zones, often ranging from 40 to more than 1,000 depending on the camera model. This segmentation allows the system to measure light intensity, color, and contrast in each zone independently, enabling algorithms to detect and prioritize specific scene elements such as expansive skies, human faces, or backlit subjects. These algorithms dynamically weight the zones based on recognized patterns, ensuring a balanced exposure that reflects the scene's overall tonal distribution rather than a simple average. A core component of this mechanism involves comparing the segmented data against an internal database of thousands of pre-registered real-world scenes to predict and apply the most appropriate exposure adjustments. For example, Nikon's 3D Color Matrix Metering system accesses a database exceeding 30,000 images, analyzing factors like subject distance and color distribution to refine its output. Similarly, Canon's evaluative metering integrates scene recognition to match patterns and optimize settings accordingly. This process builds on average metering principles by adding contextual intelligence for more nuanced results. Key technologies enhance this capability through integration with other camera functions, such as autofocus and color sensors, to perform multidimensional scene analysis. Canon's iFCL (Intelligent Focus, Color, and Luminance) system, for instance, utilizes a 63-zone metering sensor that links luminance readings with autofocus points and RGB color data, enabling precise 3D evaluation that often underexposes brighter backgrounds in portraits to emphasize the main subject. Modern implementations in cameras like the Canon EOS R5 expand to 384 zones, further improving accuracy in varied conditions. This mode is particularly suited to complex, real-world scenes with uneven lighting, such as event photography capturing crowds under mixed artificial and natural light or travel photography involving dynamic landscapes with foreground details and distant horizons. Its primary advantages lie in adaptability and intelligence, automatically handling diverse compositions to deliver consistent exposures without frequent manual intervention, as seen in its effective management of tonal balance in portraits or scenic shots. However, disadvantages include potential misinterpretation of atypical compositions, such as a small bright object against a vast dark expanse, which may result in unintended overexposure.

Highlight-Weighted Metering

Highlight-weighted metering is a mode that prioritizes the brightest areas of a scene to prevent overexposure and clipping in highlights, assigning the greatest exposure weight to these regions while potentially underexposing shadows and midtones. This approach builds on multi-zone metering techniques by analyzing light across the frame but biasing calculations heavily toward highlight zones to retain detail in bright elements. In practice, the camera evaluates the scene using data from multiple metering segments, similar to matrix or evaluative modes, but adjusts exposure to ensure highlights remain within the sensor's dynamic range, often resulting in overall underexposure that favors recoverable shadow detail in post-processing. This metering mode is particularly effective in high-dynamic-range scenes where preserving highlight detail is critical, such as concerts with spotlit performers, snowy landscapes, backlit portraits, or sunsets with intense light sources. It was introduced prominently in the 2010s, with Nikon pioneering the feature in models like the D810 in 2014, and similar implementations appearing in other brands like Sony's "Highlight" mode. Photographers often select it for scenarios where blown highlights would irreparably damage image quality, such as stage photography or outdoor events with reflective surfaces. The primary advantage of highlight-weighted metering is its ability to reduce blown-out highlights in JPEG files, ensuring that critical bright areas like skies or lights retain texture and color without the need for extensive recovery in editing software. This makes it invaluable for live events or rapid shooting where post-processing time is limited. However, a key disadvantage is that it can produce muddy or underexposed shadows, particularly in low-contrast scenes or without RAW files for shadow lifting, potentially requiring exposure compensation adjustments in varied lighting. Technically, it relies on histogram-like analysis of scene brightness, prioritizing exposure values in highlight peaks to avoid clipping, often targeting regions above middle gray to maintain detail in extreme brights.

Implementation and Usage

Integration in Camera Systems

In digital single-lens reflex (DSLR) cameras, metering sensors are typically positioned in the viewfinder path, such as the 252-zone RGB+IR sensor used in models like the Canon EOS 7D Mark II, which divides the scene into multiple segments for evaluative metering linked to autofocus points. In contrast, mirrorless cameras leverage on-sensor metering, where the image sensor itself performs light measurement; for instance, Sony's Alpha series employs a 1200-zone evaluative system integrated into the Exmor CMOS sensor, enabling real-time exposure evaluation without dedicated off-sensor hardware. This shift to on-sensor technology in mirrorless designs, facilitated by digital advancements, allows for more precise and dynamic metering directly from the capture area. Software integration ties metering modes to other camera functions, including automatic switching based on selected parameters; for example, in spot metering, the measurement area often links to the active autofocus point, as seen in Sony's Focus Point Link option, where moving the AF spot adjusts the metering spot accordingly. Exposure compensation provides an override mechanism, allowing users to manually adjust the metered value by up to ±5 stops in 1/3-stop increments on most systems, which the camera's processor applies across all modes to fine-tune exposure without altering the core metering logic. Metering modes extend compatibility to external systems like through-the-lens (TTL) flash, where the camera's evaluative or average metering influences flash power calculation; Canon's E-TTL II system, for instance, uses the camera's metering sensor to compare pre-flash and ambient light data, adjusting strobe output based on the active mode to balance fill and main illumination. User controls for metering integration are accessed via dedicated buttons or menus, with Canon and Sony models offering quick-selection dials or touchscreen interfaces to cycle through modes like evaluative, spot, or center-weighted. Active mode and any applied bias, such as exposure compensation, are displayed as icons or scales in the electronic viewfinder (EVF) or rear LCD, providing real-time visual feedback during composition.

Practical Considerations

Photographers should select metering modes based on scene characteristics to achieve accurate exposures. In high-contrast situations, such as backlit portraits or landscapes with bright skies, spot metering is preferred as it evaluates a small, targeted area (typically 1-5% of the frame), preventing the meter from being skewed by dominant bright or dark regions. For general-purpose shooting in evenly lit environments, multi-zone metering provides a reliable default by analyzing the entire frame and applying scene recognition algorithms to suggest balanced exposure. To verify metering accuracy, employing exposure bracketing—capturing a series of images at varied stops—or reviewing the in-camera histogram allows users to assess tonal distribution and adjust as needed, ensuring no clipping in highlights or shadows. A frequent challenge arises in mixed lighting conditions, like indoor scenes with outdoor windows, where the camera's meter may prioritize brighter areas, resulting in underexposed subjects. This pitfall can be addressed by activating autoexposure lock (AE-L), which holds the metered value from a specific point, such as the subject's face, even as the frame is recomposed. In practical scenarios, spot metering excels in macro photography, where it isolates the tiny subject from distracting background light variations, yielding precise detail rendition. Conversely, highlight-weighted metering suits event photography, such as weddings or theatrical performances, by prioritizing the retention of detail in bright elements like bridal gowns or stage lights, minimizing blown-out highlights. The choice of metering mode influences post-processing workflow: while RAW files offer extensive latitude for recovering over- or underexposed areas through non-destructive adjustments, in-camera JPEGs demand more precise initial metering due to baked-in processing and reduced dynamic range. Advanced users benefit from customizable options in professional cameras, such as the Nikon D850, which permits fine-tuning of center-weighted metering by adjusting the weighted area diameter (e.g., 8mm, 12mm, 15mm, or 20mm) via custom settings to tailor sensitivity to specific compositions. In video applications, metering often targets 18% gray cards to achieve balanced luminance levels around 40-50 IRE on waveform monitors, ensuring consistent tonal reproduction across shots.

References

  1. [1]
    Understanding Metering and Metering Modes - Photography Life
    Metering is how a camera evaluates light to determine exposure. Common modes include Matrix, Center-weighted, Spot, and Highlight-weighted.
  2. [2]
    Photography Glossary | Photography Terms & Video Terminology | Nikon
    Below is a merged summary of the metering modes from the Nikon Photography Glossary, combining all the information provided across the segments. To ensure a dense and comprehensive representation, I’ve organized the details into a table in CSV format, which includes all mentioned metering modes, their descriptions, key features, use cases, and relevant URLs. This format retains all details while making the information concise and easy to reference.
  3. [3]
    Understanding Metering and Which Metering Modes to Use When
    Metering refers to the process where the camera evaluates the amount of reflected light in a scene and calculates what it thinks to be the correct exposure.
  4. [4]
  5. [5]
  6. [6]
    What are metering modes, and how should I use them? - DPReview
    Aug 29, 2025 · Digital cameras are able to measure light within a scene. The camera uses that information to suggest how bright or dark your photo should be, ...Evaluative Metering · Spot Metering · Highlight-Weighted<|control11|><|separator|>
  7. [7]
    Radiometers & Photometers | Konica Minolta Sensing
    Most modern filtered photometers use silicon photo diodes which incorporate optical filters in front of the sensor so that the transmission of the filter and ...
  8. [8]
  9. [9]
    The Metering Sensor - Exclusive Architecture
    The Metering Sensor. One important task of the camera is to determine the correct exposure time that needs to be applied when the photo is taken.Missing: photometers | Show results with:photometers
  10. [10]
    Does in-camera metering affect anything but the meter in manual ...
    Sep 22, 2017 · In camera A or P or S mode, the light meter changes the exposure settings, f/stop and/or shutter speed settings, for a correct exposure.
  11. [11]
    The Difference Between In-Camera and Handheld Light Metering
    Aug 15, 2016 · A reflected light meter “assumes” that the subject is reflecting the same amount of light as a Gray Card would reflect. However, if the subject ...
  12. [12]
    Exposure variables – Making the most out of your camera - Nikonians
    Jan 25, 2016 · Incident metering systems measure the illumination falling on the subject instead of the illumination reflected from it.
  13. [13]
    [PDF] Exposure Meter Calibration - Doug A. Kerr
    May 6, 2006 · It is widely reported that Canon single lens reflex (SLR) cameras, both film and digital, utilize a value of K, the reflected light exposure.
  14. [14]
    Understanding Exposure Value, with calculator and EV chart ...
    Log₂ computes the exponent of 2, which (in the camera case) is EV (Exposure Value). The EV formula EV = log₂(N²/t) does not mention ISO directly, but Yes, EV ...Missing: log2 | Show results with:log2
  15. [15]
    Dynamic Range | Imatest
    Dynamic Range (DR) is the range of exposure, ie, scene brightness, over which a camera responds with good contrast and good Signal-to-Noise Ratio (SNR).
  16. [16]
    [PDF] EMVA Standard 1288
    Nov 29, 2010 · For example, a camera with a logarithmic instead of a linear response curve cannot be described with the present release of the standard. 4 ...
  17. [17]
  18. [18]
    The Weston Master Dynasty - Ollinger's
    In 1932 they began selling the first commercially available photoelectric light meter, the Model 617, which used a selenium photovoltaic cell and a simple meter ...
  19. [19]
    Weston Electrical Instrument Corp. Model 617 Exposure Meter
    Jun 25, 2002 · The Weston Photronic Exposure Meter model 617 was introduced ca 1932/33. ... The original Weston exposure meter was powered by two selenium cells.
  20. [20]
    Minolta SR-7, 1962-1964, 35mm SLR, first CDs meter built in
    Mar 28, 2020 · Minolta SR-7, 1962-1964, 35mm SLR, first CDs meter built in, · Comments.<|control11|><|separator|>
  21. [21]
    Pentax Spotmatic - Camera-wiki.org - The free camera encyclopedia
    May 17, 2025 · The Spotmatic SP F (Product Nr 23110), launched in 1973, was the first match-needle Spotmatic to offer open-aperture light metering, using the ...
  22. [22]
    Topcon RE Super: The First 35mm SLR With TTL Metering
    Nov 15, 2013 · 1936, Twin Lens Contaflex: First camera with a built-in exposure meter. Also unusual in being a twin lens reflex designed for 35mm film. 1938, ...
  23. [23]
    What is the Sunny 16 Rule in Photography?
    Apr 10, 2018 · The sunny 16 rule is a simple way to determine a good exposure for a photograph. On a clear, sunny day, when you are using an aperture of f/16, this rule ...<|control11|><|separator|>
  24. [24]
    Our Product History: 1990's | Information - Consumer - Nikon
    3D Color Matrix Metering using a new 1,005-pixel RGB sensor. Debut of Nikon F5. Nikon E2N/E2NS. D-SLR improves upon the Nikon E2/E2S (1995); Compressed JPEG ...
  25. [25]
  26. [26]
    Nikon D1 Review & Sample Images by Ken Rockwell
    The D1 provides 3D Digital Matrix Image Control (3D Color Matrix Metering, TTL White Balance and Tone Compensation) with a 1,005-pixel CCD for optimum results.
  27. [27]
    Sony a1 Mirrorless Camera - B&H
    In stock Rating 4.5 (192) Lock onto subjects quickly using Real-time Tracking for AI-based tracking on moving subjects or touch tracking for manual selection of the subject. Real-time ...Specs · 191 Reviews · 200 Questions, 273 Answers
  28. [28]
    Personalized Exposure Control Using Adaptive Metering and ...
    We propose a reinforcement learning approach for real-time exposure control of a mobile camera that is personalizable. Our approach is based on Markov ...
  29. [29]
    ISO 12232:2019 - Photography — Digital still cameras
    This document specifies the method for assigning and reporting ISO speed ratings, ISO speed latitude ratings, standard output sensitivity values, and ...
  30. [30]
    Beginner's Guide: Understanding Metering Mode
    When Spot metering is used, the photo's overall exposure (bottom left) increases and looks brighter as the metering point falls on the dim traffic road in the ...
  31. [31]
    Camera metering modes explained
    ### Spot Metering Summary
  32. [32]
    Metering Mode Selection on the EOS R5. - Canon Knowledge Base
    General-purpose metering mode suited even for backlit subjects. The camera adjusts the exposure automatically to suit the scene. ... Effective where there are ...
  33. [33]
    Metering - of Nikon Online Documentation
    [Spot metering]. The camera meters a circle with a diameter of 4 mm/0.16 in. (equivalent to approximately 1.5% of the frame). This ensures that the subject ...Missing: explanation | Show results with:explanation
  34. [34]
    Understanding Metering Modes | Photzy
    "Spot-metering mode is one of the most powerful tools on your camera!" Center-Weighted. The center-weighted metering mode concentrates 60 to 80 percent of ...
  35. [35]
    metering – Ming Thein | Photographer
    Sep 25, 2013 · The two metering values are combined in a predetermined ratio – usually 70-30 in favor of the central portion, sometimes 60-40 – to determine ...
  36. [36]
    Details about Camera Metering Principles
    Center Weighted Metering: Meter sensitivity is biased toward the center of the viewfinder. Recommended when the subject is in the center of the picture.
  37. [37]
    Definition of Center-Weighted Metering - Canon Knowledge Base
    DEFINITION: The TTL-type exposure metering system which concentrates a large percentage of its sensitivity in the center of the picture frame. DESCRIPTION:.
  38. [38]
    Metering - of Nikon Online Documentation
    Center-weighted: Camera meters entire frame but assigns greatest weight to center area (if CPU lens is attached, size of area can be selected using Custom ...Missing: explanation | Show results with:explanation
  39. [39]
    Help Guide | Metering Mode - Sony Corporation
    Center: Measures the average brightness of the entire screen, while emphasizing the central area of the screen (Center-weighted metering). Spot ...
  40. [40]
  41. [41]
  42. [42]
    Exposure Meters - Antique and Vintage Cameras - Early Photography
    Some early meters provided a way of gauging not only the light level but other factors as well; taking a meter reading was similar to making a test exposure.Extinction Meters · Photoelectric · Built-in Meters · Exposure Value (EV)
  43. [43]
    Information related to F Lens Mount from Nikon - Part 1 - MIR
    Note: Nikkormat FT's metering is a full frame average metering (Meaning the meter will measure light at the whole 36 x 24mm frame and give an average ...
  44. [44]
    How to Use Metering Mode - 42West, Adorama Learning Center
    Feb 24, 2023 · Center-weighted metering mode uses different weights for the amount of light in the circular area at the scene's center of the scene compared to ...
  45. [45]
  46. [46]
    Camera Basics #7: Metering - SNAPSHOT
    Feb 2, 2017 · In evaluative metering, the camera breaks the image frame down into a number of different zones, measures the amount of light in each zone, and ...<|separator|>
  47. [47]
    An Intro to Camera's Metering Modes - Visual Wilderness
    Feb 27, 2017 · It allows you to get a light reading on subjects that may be off-center from your focal point. Instead of pinpointing one specific spot in the ...
  48. [48]
    Camera Metering Modes Explained - Great Big Photography World
    Sep 28, 2024 · Knowing how and when to use which metering mode can initially be a bit confusing. You can learn about the various modes in this article.Missing: advantages disadvantages
  49. [49]
    Understanding Camera Metering Modes | B&H eXplora
    Mar 11, 2015 · In this B&H article, Todd Vorenkamp explains everything you've ever wanted to know about camera metering modes.Missing: bias | Show results with:bias
  50. [50]
    What's The Best Metering Mode For Your Camera?
    Aug 6, 2023 · The Canon EOS R5 has 384 metering zones, the Fujifilm X-T5 has 256 and the Sony A7 IV has an incredible 1,200 zones. ... Nikon uses matrix ...
  51. [51]
  52. [52]
    Canon metering modes: how to get perfectly exposed images in any ...
    Apr 15, 2014 · In Evaluative mode, this sensor not only measures the brightness of a scene across all 63 zones, but takes into account colours and which parts ...
  53. [53]
  54. [54]
    Nikon Highlight Metering Mode - Tom Bol Photography, LLC
    Oct 30, 2019 · A few years ago (starting with D810) Nikon introduced a new metering mode…and many photographers I've talked to don't even know it exists.
  55. [55]
    How to Supercharge Your Photography with Highlight-Weighted ...
    Highlight-weighted metering utilizes the incredible dynamic range of modern image sensors to give you a massive degree of control over your photos.Different Metering Modes For... · Exposing For The Highlights · Metering Mode Comparison
  56. [56]
    Nikon's Highlight-Weighted Metering Mode (D5, D850, D810, D750 ...
    Mar 13, 2019 · Highlight-weighted metering prevents overexposure of highlights, but may result in dark shadows. It is a metering mode, not an exposure mode.Missing: explanation | Show results with:explanation
  57. [57]
    ILCE-6400 Specifications | Sony USA
    Metering Sensor. Exmor® CMOS sensor. Exposure. Metering Type. 1200-zone evaluative metering. Viewfinder. Field Coverage. 100%. Brightness Control (Viewfinder).
  58. [58]
    metering - Where are the exposure sensors on a mirrorless camera?
    Sep 1, 2017 · Modern mirrorless cameras use the uncovered image sensor to measure the amount of light entering the camera.How does mirrorless camera autofocus work with very "slow" lenses?Do point and shoot cameras have a metering sensor?More results from photo.stackexchange.com
  59. [59]
    Spot Metering Point - ILCE-7RM4 - Sony Corporation
    The spot metering position does not coordinate with the focus area, but always meters brightness at the center. Focus Point Link: The spot metering position ...
  60. [60]
    What is E-TTL II Flash Metering? - SNAPSHOT
    Apr 27, 2018 · E-TTL II uses information about the distance from the lens to the subject in its evaluation of the optimal flash output.
  61. [61]
    How to use my camera's light meter - DPReview
    Oct 6, 2025 · Luckily, almost every digital camera features a built-in meter that measures the light in a scene, making it easier to get your settings right. ...Missing: components | Show results with:components
  62. [62]
    How to Use Spot Metering in Photography - 42West, Adorama
    Aug 8, 2022 · Spot metering meters a small spot, usually the center, and disregards the rest. Point the center dot at your subject and adjust to neutral.
  63. [63]
    Metering modes explained and how to know which one to use
    Most of today's modern cameras have at least three different metering modes to choose from; matrix (evaluative), center-weighted, and spot.Missing: variants adjustable
  64. [64]
    Bracketing in Photography: The Ultimate Guide
    Bracketing is a camera technique where you capture several different exposures of the same scene. In other words, you capture a standard image (below, top), a ...
  65. [65]
    7 Common Exposure Problems And How To Fix Them - Contrastly
    7 Common Exposure Problems And How To Fix Them ; 1. Changing the exposure mode. Exposure and Camera Mode photo by Håkan Dahlström ; 2. Underexposed backlit ...
  66. [66]
    Photography Tip #95: Understand Metering Modes - CameraTale
    Sep 4, 2025 · Exposure compensation tells the camera to bias exposure brighter or darker than the meter suggests. Combine it with AE-Lock (Auto-Exposure Lock) ...
  67. [67]
    Camera Metering Modes Explained – How to Use Metering Modes
    In this guide to camera metering modes in photography, we'll dive not only into what are the different metering modes, but also how to use metering modes.<|control11|><|separator|>
  68. [68]
    Shoot RAW vs. JPEG: Which format should you choose? - Adobe
    Post-processing. Higher image quality translates into more available data when it comes to photo editing, giving RAWs a definitive edge over JPEGs. Editing ...
  69. [69]
    b6: Center-Weighted Area - of Nikon Online Documentation
    A Custom Settings: Fine-Tuning Camera Settings; b6: Center-Weighted Area. b6 ... Choose the size of the area given the most weight in center-weighted metering.
  70. [70]
    Exposure Value (EV) Explained - Plus EV Charts - Photography Life
    Dec 29, 2019 · Exposure Value (EV) is simply a way to combine shutter speed and aperture to a single value. Although shutter speed an aperture both carry a lot ...Missing: log2 N² /