Single-lens Reflex Camera

Parallax is an apparent displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.

Viewfinder is what the photographer looks through to compose, and in many cases to focus, the picture

Contrast ratio is a measure of a display system, defined as the ratio of the luminance of the brightest color (white) to that of the darkest color (black) that the system is capable of producing.

Refresh rate is the number of times in a second that display hardware draws the data.

Aperture is a hole or an opening through which light travels.

A Shutter is a device that allows light to pass for a determined period of time, for the purpose of exposing photographic film or a light-sensitive electronic sensor to light to capture a permanent image of a scene.


Exposure is the total amount of light allowed to fall on the photographic medium during the process of taking a photograph.

Depth of field is the portion of a scene that appears acceptably sharp in the image.

F-Stop A measure of the size of the opening in a lens calibrated to a corresponding focal length.

A Focal length of a lens is defined as the distance in mm from the optical center of the lens to the focal point.