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C mount lens & cs mount lens
| CCTV glossary (глоссарий терминов по видеонаблюдению) |
There are two main types of lenses used in security cameras. the c mount lens has a flange back distance of 17.5mm. the cs mount lens has a flange back distance of 12.5mm. c mount lenses therefore have a longer focal distance. cs mount became widely used, because it its more practical for many of today`s more compact cameras. lenses are often supplied with a 5mm spacer ring (sometimes called a c ring) that allows a c mount lens to be used on a cs camera. most modern security cameras are cs.
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Back light compensation, английский
This is a feature of security cameras that automatically adjusts the image to compensate for bright light to give more detail on the darker areas of the image. for example, use is to focus on the detail of a face of a person that has the sunlight shining from behind.
Dwell time programming, английский
The length of time a switcher or cctv multiplexer displays one camera before sequencing to the next. multiplexers with dwell time programming capability allow you control this length of time.
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