Terminology Compilation

Focal Length (FL)

The distance between the optical centre of a lens and the principal convergent focus point.


The size of the cameras imager. Current standards are 1/2, 1/3, 1/4 inches.


A whole video image; is composed of two interlaced fields. A CCD chip produces 30 frames per second at NTSC system and 25 frames at PAL.

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