Contents 1 Examples of metering modes 1.1 Spot metering 1.2 Center-weighted average metering 1.3 Average metering 1.4 Partial (selective) metering 1.5 Multi-zone metering 1.6 Highlight-weighted metering 2 See also 3 References 4 External links

Examples of metering modes[edit] Cameras generally allow the user to select between spot, center-weighted average, or multi-zone metering modes. Various metering modes are provided to allow the user to select the most appropriate one for use in a variety of lighting conditions. Spot metering[edit] With spot metering, the camera will only measure a very small area of the scene (1–5% of the viewfinder area). This will by default be the very centre of the scene. The user can select a different off-centre spot, or to recompose by moving the camera after metering. The first spot meter was built by Arthur James Dalladay, editor of The British Journal of Photography in about 1935 and described it in the BJP Almanac of 1937 on pages 127 to 138.[1] A few models (including the Olympus OM-4, Canon T90, and in the digital world, the Olympus C-5050z) support a Multi-Spot mode which allows multiple spot meter readings to be taken of a scene that are averaged. Some cameras, the OM-4 and T90 included, also support metering of highlight and shadow areas. Spot metering is very accurate and is not influenced by other areas in the frame. It is commonly used to shoot very high contrast scenes. For example, if the subject's back is being hit by the rising sun and the face is a lot darker than the bright halo around the subject's back and hairline (the subject is "backlit"), spot metering allows the photographer to measure the light bouncing off the subject's face and expose properly for that, instead of the much brighter light around the hairline. The area around the back and hairline will then become over-exposed. Spot metering is a method upon which the Zone System depends. In many cases the camera will over or underexpose, when using the spot mode. Modern cameras tend to find the correct exposure precisely. In complex light situations though, professional photographers tend to switch to manual mode, in order to ensure the same exposure in every photograph. Another example of spot metering usage would be when photographing the moon. Due to the very dark nature of the scene, other metering methods tend to overexpose the moon. Spot metering will allow for more detail to be brought out in the moon while underexposing the rest of the scene. More commonly, spot metering is used in theatre photography, where the brightly lit actors stand before a dark or even black curtain or scrim. Spot metering only considers the actors in this case, while ignoring the overall darkness of the scene. Center-weighted average metering[edit] In this system, the meter concentrates 60–80% of the sensitivity towards the central part of the viewfinder. The balance is then "feathered" out towards the edges. Some cameras will allow the user to adjust the weight/balance of the central portion to the peripheral one. One advantage of this method is that it is less influenced by small areas that vary greatly in brightness at the edges of the viewfinder; as many subjects are in the central part of the frame, more consistent results can be obtained. When moving the focus point off center the camera will proceed as above, but at the chosen focus point. Although promoted as a feature, center-weighted metering was originally a consequence of the meter cell reading from the focusing screen of SLR cameras. Light scatter from the focusing screen and proximity of the meter cell caused fall off at the edges. Average metering[edit] In this metering mode, the camera will use the light information coming from the entire scene and averages for the final exposure setting, giving no weighting to any particular portion of the metered area. This mode tends to be precise because all parts of the scene are taken into consideration. Bright parts such as sky will not blow out. In some situations cameras tend to be overwhelmed such as by a snowy landscape. Photographs in such situations are often underexposed by 2 f-stops or more. Partial (selective) metering[edit] This mode meters a larger area than spot metering (around 10–15% of the entire frame), and is generally used when very bright or very dark areas on the edges of the frame would otherwise influence the metering unduly. Like spot metering, some cameras can use variable points to take readings from, (in general autofocus points), or have a fixed point in the centre of the viewfinder. Partial metering is found mostly on Canon cameras. Leica SLR film cameras always featured selective metering. The original Leicaflex and Leicaflex SL only provided selective metering, later Leica R cameras had selectable centre weighted / selective metering. Multi-zone metering[edit] Honeycomb Metering on a Dynax 5D. The AF point was set to the eye of the toy; the camera has been able to produce a good exposure, by not being fooled by the strong back lighting of the out of focus areas. This mode is also called matrix, evaluative, honeycomb, segment metering, or esp (electro selective pattern) metering on some cameras. This metering mode was first introduced by the Nikon FA, where it was called Automatic Multi-Pattern metering. On a number of cameras this is the default/standard metering setting. Here the camera measures the light intensity in several points in the scene, and then combines the results to find the settings for the best exposure. How they are combined/calculated deviates from camera to camera. The actual number of zones used varies wildly, from several to over a thousand. However performance should not be concluded on the number of zones alone, or the layout. In general, the most advanced metering is found on single-lens reflex cameras. Many manufacturers are less than open about the exact calculations used to determine the exposure. A number of factors are taken into consideration, including the following: Autofocus point, distance to subject, areas in focus or out of focus, colours/hues of the scene, and backlighting. Multi-zone tends to bias its exposure towards the autofocus point being used (while taking into account other areas of the frame too), thus ensuring that the point of interest has been exposed for properly, (this often means the subject area being exposed for as a mid-tone). A database of many thousands of exposures is pre-stored in the camera, and the processor can use a selective pattern to determine what is being photographed.[2] Some cameras allow the user to link or unlink the autofocus and metering, and allow the option of locking exposure once AF confirmation is achieved, AEL, (auto-exposure lock). Using manual focus, and on many compacts/bridge cameras, the AF point is not used as part of the exposure calculation, in such instances it is common for the metering to default to a central point in the viewfinder, using a pattern based on that area. There is considerable variation from different manufacturers as to how multi-zone metering is implemented, and even from the same maker in their model range, and how much "priority" is given to the AF point itself. Some "Scene" modes, such as sunset, sports, night exposures etc., also often affect the calculations of this metering pattern. However, some photographers may be uncomfortable with multi-zone metering. This tends to stem from a lack of clarity about "how" the camera reacts in certain situations. The design concept behind multi-zone is to reduce the need to use exposure compensation.[3] Some users have problems making wide-angle shots with high contrast, due to the large area which can vary greatly in brightness. It is important to understand that even in this situation, the focus point can be critical to the overall exposure. Highlight-weighted metering[edit] Clipping is reduced by using a high resolution metering sensor and analyzing each area for blown highlights or underexposed shadows.[4] Although there are some similarities with multi-zone, matrix, or evaluative metering, this mode uses a high-resolution sensor for detailed detection and gives more weight to reduce clipping. First used in the Nikon D810.[5]

See also[edit] Feathering Vignetting

References[edit] ^ Hicks, Roger W. (October 2002). "The SEI Photometer A Legend Among Spot Meters". Shutterbug Magazine. Archived from the original on 12 June 2009. Retrieved 15 December 2009.  ^ "Exposure Metering". Nikon Corporation. Archived from the original on 2010-04-28.  ^ Canon technology description for evaluative metering. Archived May 22, 2007, at the Wayback Machine. ^ "Nikon D810 Announcement". PhotographyLife.  ^ "First Look Review: Nikon D810". Amateur Photographer. 

External links[edit] Metering in the Digital Photography Review glossary. Highlight-Weighted Metering: Technical Details and Use Nikon v t e Photography Outline Terminology 35 mm equivalent focal length Angle of view Aperture Black and white Chromatic aberration Circle of confusion Color balance Color temperature Depth of field Depth of focus Exposure Exposure compensation Exposure value Zebra patterning F-number Film format Large Medium Film speed Focal length Guide number Hyperfocal distance Metering mode Orb (optics) Perspective distortion Photograph Photographic printing Photographic processes Reciprocity Red-eye effect Science of photography Shutter speed Sync Zone System Genres Abstract Aerial Architectural Astrophotography Banquet Conceptual Conservation Cloudscape Documentary Ethnographic Erotic Fashion Fine-art Fire Forensic Glamour High-speed Landscape Lomography Nature Neues Sehen Nude Photojournalism Pornography Portrait Post-mortem Selfie Social documentary Sports Still life Stock Street Vernacular Underwater Wedding Wildlife Techniques Afocal Bokeh Brenizer Burst mode Contre-jour Cyanotype ETTR Fill flash Fireworks Harris shutter HDRI High-speed Holography Infrared Intentional camera movement Kirlian Kite aerial Long-exposure Macro Mordançage Multiple exposure Night Panning Panoramic Photogram Print toning Redscale Rephotography Rollout Scanography Schlieren photography Sabatier effect Stereoscopy Stopping down Strip Slit-scan Sun printing Tilt–shift Miniature faking Time-lapse Ultraviolet Vignetting Xerography Composition Diagonal method Framing Headroom Lead room Rule of thirds Simplicity Golden triangle (composition) Equipment Camera light-field field instant pinhole press rangefinder SLR still TLR toy view Darkroom enlarger safelight Film base format holder stock Filter Flash beauty dish cucoloris gobo hood hot shoe monolight Reflector snoot Softbox Lens Wide-angle lens Zoom lens Telephoto lens Manufacturers Monopod Movie projector Slide projector Tripod head Zone plate History Timeline of photography technology Analog photography Autochrome Lumière Box camera Calotype Camera obscura Daguerreotype Dufaycolor Heliography Painted photography backdrops Photography and the law Glass plate Visual arts Digital photography Digital camera D-SLR comparison MILC camera back Digiscoping Digital versus film photography Film scanner Image sensor CMOS APS CCD Three-CCD camera Foveon X3 sensor Image sharing Pixel Color photography Color Print film Reversal film Color management color space primary color CMYK color model RGB color model Photographic processing Bleach bypass C-41 process Cross processing Developer Digital image processing Dye coupler E-6 process Fixer Gelatin silver process Gum printing Instant film K-14 process Print permanence Push processing Stop bath Lists Most expensive photographs Photographers Norwegian Polish street women  Category  Portal Retrieved from "" Categories: Camera featuresHidden categories: Webarchive template wayback links

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