Posts Tagged ‘
lens’
Tuesday, September 6th, 2011
Security Camera King has a full selection of hidden camera equipment to satisfy your needs. Modern technology has resulted in a tremendous variety of disguised and hidden camera equipment. As a matter of fact, the smallest hidden camera that we offer for sale is the size of a Phillips head screw!
How does hidden camera equipment work? The following is a brief explanation.
First the camera must have a lens. The lens’s duty is to gather the light reflected by the objects in its field of view and focus them onto a sensor chip no larger than 1/4 to 1/3 inches square. Most often but not always, hidden cameras use 3.7 mm wide angle lenses.
Tags: ccd, cmos, DVR, lens, sensor chip
Posted in
Spy and Surveillance|
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Sunday, November 29th, 2009
For the novice, security cameras choices may seem confusing. One question often asked by customers is what is a Vari-Focal Lens? There are two basic types of CCTV lenses. You can either get a fixed lens, or a vari-focal lens. A fixed lens has a set aperture that cannot be changed. They can be used for overviews or for close up detail, but they cannot be used for both or be adjusted. When you purchase a fixed lens, you will want to use a lens caluculator to make sure you are getting a lens with the correct aperture since you cannot adjust it once you install it.
Tags: fixed lens, lens, varifocal
Posted in
CCTV Articles|
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