Bolide Full Product Catalog

Easy iPac Installation Guide

Multi IP Cameras Installation Guide

NVMS(Network Video Management Software) Installation Guide

SVR9000s Remote Setup Guide

SVR8000 Remote Setup Guide

SVR8000 Series DVR Comparison

SVR9000s S-Box Series DVR Comparison

CCTV Glossary
The following is a list of commonly used terms related to CCTV, with a brief description of the meanings. These terms are not specific to Bolide Technology Group, they are general terms used throughout the CCTV industry. If you don't find the term you are looking for, or you find any error, please contact us.
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Focal Length
The distance between the centre of a lens, or its secondary principal point and the imaging sensor. Lower lengths give a greater field of view and less magnification. Longer lengths give a narrower field of view and greater magnification. The table below gives an approximate value for the angle of the field of view for lenses of various focal lengths. 30˚ is considered to be a normal view, telephoto (longer) lenses have lower angles. Most CCTV cameras have one of the 3 sizes of imaging devices listed below, 1/4", 1/3" or 1/2". As you can see, this makes a big impact when choosing lenses.

Frame
This refers to a full TV picture. The PAL signal transmits 25 full frames per second.