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Glossary of CCTV Terms (Page 5)
- SPOT FlLTER - A small insert used in a lens to increase the f-stop range of the lens.
- SYNC - Electronic pulses that are inserted in the video signal for the purpose of assembling the picture information in the correct position.
- TEARlNG - A picture condition in which horizontal lines are displaced in an irregular manner.
- TERMlNATlON - A non-inductive resistor that has the same resistance as the characteristic of the cable being used. TRACKlNG - A zoom lens' ability to remain in focus during the entire zoom range from wide angle to telephoto position.
- VERTlCAL lNTERVAL - The time of vertical retrace.
- VERTlCAL RETRACE - The return of the electron beam to the top of a television picture
tube screen or a camera pickup device target at the completion of the field scan.
- VlDEO TYPE 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.
- VlDlCON - A common type of camera pickup tube. It translates the effect of light striking its photo-sensitive surface into electrical impulses.
- ZOOM LENS - A lens system that may be effectively used as a wide angle, standard or telephoto lens by varying the focal length of the lens.
- ZOOM RATlO - The ratio of the starting focal length (wide position) to the ending focal length (telephoto position) of a zoom lens. A lens with a 1 OX zoom ratio will magnify the image at the wide angle end by 10 times.
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