Fixed aperture

The size of the primary optical surface of an astronomical instrument (telescope), usually given in inches, centimeters, or meters. In the case of a reflecting telescope, the ...

aperture

Archaeology; Evolution

Of a camera, the adjustable opening through which light passes to reach the film. The diameter of the aperture determines the intensity of light admitted. The pupil of a human eye ...

aperture

Education; SAT vocabulary

Hole.

aperture

Biology; Anatomy

A hole or an opening. The opening in the lens of a camera that allows light to pass through it is an aperture.

rubber lens-mount gasket

Photography; Professional photography

A flexible rubber gasket that forms a seal between the lens and the camera body.

subject-to-camera distance information

Photography; Professional photography

The data supplied to the camera by the lens indicating the distance from the camera to the subject. This information makes possible advances like 3D Color Matrix Metering II and ...

vignetting

Photography; Professional photography

A loss of brightness or saturation at the periphery of an image; usually not desired, but sometimes used to create a vignette framing the subject at the center of the image.

special effects mode

Photography; Professional photography

A mode in which the user can create artistic results simply by adding special effects to still images and movies. To select an effect, the user rotates the mode dial to EFFECTS ...

still picture

Photography; Professional photography

A photograph (static image) as opposed to a movie (moving picture).

stop-motion

Photography; Professional photography

Generic term for an animation technique which makes static objects appear to move. This is done by recording each movement of the object as an individual frame, when each frame ...