Digital SLR Camera Basics



The number of images that can be recorded to a memory card or other storage device. The number of images that can be recorded varies with image quality and size.

color cast

A tint (generally unwanted) evenly applied to an entire image.


The arrangement of the subject and other objects in the frame.


An algorithmic method of reducing file size.


Difference in brightness. Increasing contrast increases the difference in density between light and dark areas of the image, while decreasing contrast decreases the difference in density.

contrast-detect autofocus

A type of autofocus that analyzes subject image data from the image sensor and chooses the lens position that produces the greatest contrast.

See also: phase-detection autofocus