1. What Is Aperture Priority Mode? When Might You Use This Mode On A Camera?

A Nikon-style mode dial showing discontinuity priority style.

Discontinuity priority, often abbreviated A or Av (for discontinuity value) on a camera fashion dial, is a setting on some cameras that allows the user to set a specific discontinuity value (f-number) while the camera selects a shutter speed to match it that volition result in proper exposure based on the lighting weather equally measured past the camera'southward lite meter. This is dissimilar from transmission fashion, where the user must make up one's mind both values, shutter priority where the user picks a shutter speed with the camera selecting an advisable aperture, or program mode where the camera selects both.^[1]

Uses [edit]

Depth of field [edit]

Equally an image's depth of field is inversely proportional to the size of the lens's discontinuity, aperture priority way is oftentimes used to allow the photographer to control the focus of objects in the frame. Discontinuity priority is therefore useful in landscape photography, for case, where it may be desired that objects in foreground, centre distance, and groundwork all be rendered crisply, while shutter speed is immaterial. To obtain this large depth of field, a narrow discontinuity (identified by a high f-number, e.g. f/xvi or f/22) is necessary. Discontinuity priority mode also finds use in portrait photography, where a wide aperture (identified by a low number, e.g. f/i.4 or f/ii.8) and therefore smaller depth of field may be desired to throw the groundwork out of focus and make it less distracting.^[1]

Shutter speed [edit]

Another common use of discontinuity priority mode is to indirectly affect shutter speed for a desired issue. In landscape photography, a user might select a pocket-sized aperture when photographing a waterfall, so that the camera will select a deadening shutter speed (to permit a sufficient amount of light to reach the motion-picture show or sensor for proper exposure), thereby causing the water to mistiness through the frame.^[2] At the contrary, a larger aperture allows to shorten the shutter speed reducing the hand jitter past taking a picture without a tripod or, in culling, a lower ISO to enhance the image quality by reducing the racket. When shooting a portrait in dim lighting, the photographer might choose to open the lens to its maximum discontinuity in hopes of getting enough light for a proficient exposure while maintaining the shortest possible shutter speed to reduce mistiness.

References [edit]

^ ^a ^b Gibson, Andrew S. (12 May 2012). "Aperture Priority and Shutter Priority: Exposure Lesson #i". Digital Photography School. Archived from the original on 18 July 2016. Retrieved 21 July 2016.
^ Hoffmann, Reed. "How to Shoot Blurry Water Photos". reedhoffmann.com. Archived from the original on 15 October 2013. Retrieved 22 July 2016.