What do the different camera lens terms mean?
Auto Iris Lens – A lens in which the iris aperture automatically opens or closes to maintain proper light levels on the face-plate of the camera pickup device. Video Type Auto Iris Lens – An auto iris lens with internal circuit which receives voltage and a video signal from the camera to adjust the iris. DC Type Auto Iris Lens – An auto iris lens without an internal circuit to control the iris. All iris control voltages come from a circuit located within the camera. Manual Iris Lens – A lens with a manual adjustment to set the iris opening (F stop) in a fixed position. Generally used for fixed lighting applications. Angle of View – The angular range that can be focused within the image size. Small focal lengths give a wide angle of view and large focal lengths give a narrow field of view. F-Stop – A term used to indicate the speed of a lens. The smaller the f-number, the greater is the amount of light passing through the lens.
