Autobracketing

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本文详细介绍了自动曝光补偿（AEB）的概念及其在不同场景下的应用，包括自动曝光、闪光、ISO、白平衡和对焦的自动补偿。通过使用多种参数组合，自动曝光补偿帮助摄影师在复杂光线条件下获得最佳照片效果。

http://en.wikipedia.org/wiki/Autobracketing

Autobracketing

From Wikipedia, the free encyclopedia

Autobracketing is a feature of some more advanced cameras, whether film or digital cameras, particularly single-lens reflex cameras, where the camera will take several successive shots (often three) with slightly different settings. Two modes are used: The images are automatically combined, for example Automatic Exposure Bracketing into one High dynamic range image, or the best-looking separately stored pictures can be picked later from the batch. When the photographer achieves the same result by changing the camera settings between each shot, this is simply called bracketing.

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Automatic Exposure Bracketing[edit]

See also: Exposure bracketing

The most common type of autobracketing is exposure autobracketing (often abbreviated to AEB for Automatic Exposure Bracketing or BR for Bracketing), where the camera is set to capture the same image several times with differentexposure settings, both over-exposed and under-exposed (lighter and darker) compared to the current setting on the camera,^[1] which may already include exposure compensation. Depending on the camera, the difference between each of the autobracketed shots could be anywhere from one-quarter^{[# 1]} up to three^{[# 2]} full stops in each direction, in full, half, third or quarter^{[# 1]} stop^{[# 3]} increments, ranging from two up to nine^{[# 1]} shots in series. Sometimes it is possible to either define the order, in which the shots will be taken, or to give an offset^{[# 1]} as a start-point of the bracketing series. More sophisticated equipment allows auto-exposure bracketing to be combined with timer and intervalometer functions as well.^{[# 1]}

Cameras can perform autobracketing by adjusting either the shutter speed (typically in aperture priority mode, sometimes also in manual or program mode) or the aperture setting (typically in shutter priority mode). In programmedexposure mode, many cameras will alter both parameters at the same time. Some cameras allow to swap the parameter used for shifting in manual mode.^{[# 4]} Digital cameras may also alter the ISO setting if auto-ISO is enabled.

Exposure autobracketing is most commonly used with color reversal film (slide film) because of its small exposure latitude compared with print film (which has a wide exposure latitude) and digital cameras (which enable the photographer to review the captured image). In digital photography, autobracketing is convenient to shoot pictures for high dynamic range imaging.^[1]^[2]

Automatic Flash Bracketing[edit]

Automatic ISO Bracketing[edit]

Automatic White-Balance Bracketing[edit]

Automatic Focus Bracketing[edit]

Smooth Trans Focus function[edit]

Automatic Dual-Bracketing[edit]

A new Automatic Dual-Bracketing is launched in point-and-shoot camera/compact camera which use 2 choices parameters combinations of white balance, exposure, focus, color saturation, and shutter speed and gives multi images.^[3]^[4]

Notes[edit]

^ Jump up to:^a ^b ^c ^d ^e The Minolta 7000 and 9000 (1985), in conjunction with the Minolta Program Back Super 70 / 90 (PBS-70/PBS-90) or the 100-Exposure Back EB-90, support aperture and shutter speed settings in quarter-step increments. In order to cope with the finer granularity, aperture and shutter speed settings are displayed in a proprietary suffixed notation, that is, a full f-stop of 2.8 is displayed as 2.8₀, the next quarter-steps would be 2.8₁, 2.8₂, 2.8₃, before it would continue with 4.0₀, etc. Auto-exposure bracketing can be configured for a start point between -6.0EV and +6.0EV in 1/4EV steps, with a step granularity of either 1/4, 1/2, 1 or 2EV and a bracket length ranging from 1 to 8 frames. Additionally, it can be combined with built-in timer and intervalometer functions, which provide options to set the start date and time (that is, the year, month, day, hour, and minute of the first exposure in the row), the number of groups (1 to 99 frames), the count of frames per group (1 to 9) as well as the interval time (up to 99h, 59min, 59s).
Jump up^ With firmware 2.0, the Sony Alpha DSLR-A850 and DSLR-A900 support an additional auto-exposure bracking setting for ±3.0 EV in three frames. (Sony press release as of 2 December 2010)
Jump up^ Photographers commonly refer to exposure changes in terms of "stops", but properly, an aperture stop is a device that regulates the amount of light, while a step is a division of a scale. The standard exposure scale consists of power-of-two steps; a one-step exposure increase doubles the exposure, while a one-step decrease halves the exposure; these steps are what are commonly referred to as stops.
^ Jump up to:^a ^b By default, various Minolta, Konica Minolta and Sony Alpha cameras (including the Maxxum 9 (de), Maxxum 7, Maxxum 7D, DSLR-A850 and DSLR-A900) will shift the shutter speed when bracketing in manual mode, however, if the AEL button is pressed (or set on hold via custom-function) while releasing the shutter, they will instead shift the aperture value.