Difference between revisions of "Aperture priority"

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(cross-link to shutter priority)
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'''Aperture-priority''' describes a [[Light meter|metering]] method which recommends (or sets automatically) a shutter speed based on the [[Lens#Aperture|aperture]] set by the user.
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'''Aperture-priority''' describes a [[Light meter|metering]] method which automatically sets (or displays) a shutter speed, based on the [[Lens#Aperture|aperture]] chosen by the user. The term typically refers to a camera offering autoexposure—for example, one where an '''A''' or '''Auto''' position is found on the shutter-speed control. But aperture priority could also describe a method of manual exposure metering.
  
Given a choice of metering method, Aperture Priority may be chosen when control of [[depth-of-field]] is required. This may be either to ensure objects at different distances are in focus - by specifying a small aperture, or that some objects (perhaps the subject of a photo) are in focus whilst others (perhaps the background) are not - by specifying a large aperture.
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Aperture Priority may be be the preferred type of metering when control of [[depth-of-field]] is required. This may be either to ensure objects at different distances are in focus - by specifying a small aperture, or that some objects (perhaps the subject of a photo) are in focus whilst others (perhaps the background) are not - by specifying a large aperture.
  
 
(Compare with '''[[Shutter priority]]'''.)
 
(Compare with '''[[Shutter priority]]'''.)

Revision as of 15:09, 30 September 2011

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Glossary Terms

Aperture-priority describes a metering method which automatically sets (or displays) a shutter speed, based on the aperture chosen by the user. The term typically refers to a camera offering autoexposure—for example, one where an A or Auto position is found on the shutter-speed control. But aperture priority could also describe a method of manual exposure metering.

Aperture Priority may be be the preferred type of metering when control of depth-of-field is required. This may be either to ensure objects at different distances are in focus - by specifying a small aperture, or that some objects (perhaps the subject of a photo) are in focus whilst others (perhaps the background) are not - by specifying a large aperture.

(Compare with Shutter priority.)