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A lens whose curved surface does not conform to the shape of a sphere; lenses are usually ground or moulded with spherical surfaces.  Because spherical surfaced lenses have difficulty in correcting distortion in ultra-wideangle lenses or coma in large-aperture lenses brought about by spherical aberration, aspherical lens elements are often used used.

Aspheric lens

Also sometimes refer as ABC (Auto Bracketing Control).  A metering feature that automatically produces several different exposures with one press of the shutter release.  Usually one image is at the exposure recommended by the camera with the others at user specified intervals above or below the recommended setting.

AEB (Auto Exposure Bracketing)

A shutter speed setting that allows for long exposures.  When set on B, the shutter will stay open as long as the shutter release button remains depressed.

B (Bulb) setting

Light coming from behind the subject, toward the camera lens, so that the subject stands out vividly against the background.  Sometimes produces a silhouette effect.


A lens aberration where straight lines are bowed in at the edges of the picture frame resembling the sides of a barrel.  Most common in wide angle lenses and uncorrected in fisheye lenses.

Barrel distortion

Flash or tungsten light bounced off a reflector (such as the ceiling or walls) or attachment that fits on the flash to give the effect of natural or available light.

Bounce lighting

Taking a series of photographs of the same subject while altering one feature (often exposure, flash or white balance) to ensure the "correct" exposure or style.


Movement of camera caused by an unsteady hold or support leading to a blurred image.

Camera shake