Sony SSC-C108P 매뉴얼 - 페이지 19

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Selecting the Correct Lens

Another characteristic of lenses is the 'depth of field' (see illustration). If a lens is

focused on an object there will be a certain area of sharp focus in front of and

behind the object. The depth of this area of sharp focus is controlled by three

factors: the focal length of the lens, the distance from the lens to the object

and the F stop.

Lens Format

The lens format relates to the camera format, 1/3 inch, 1/2 inch, 2/3 inch.

There are two lens mounting systems. Most CCTV cameras have a 'C' mount,

although many now use a 'CS' mount. 'C' mount cameras are not able to use 'CS'

lenses, however adaptors are available.

To avoid the complexities of lenses with automatic irises, manufacturers have

developed 'electronic shutters'. These achieve the same light adjustment with

simpler, fixed iris lenses. The CCD iris common to most Sony CCTV cameras

automatically controls image exposure by electronically adjusting the incoming

light levels.

Cameras with Built-in Lens

Some cameras are now available with a built-in lens. Sony manufactures a 1/3 inch

colour camera with an integral 5.4mm - 64.8mm zoom lens (SSC-CX34P) which

can be used in place of the conventional camera and motorised lens set-up. This

saves installation time and the resultant set-up is lighter, allowing the use of more

compact camera housing and pan and tilt head.

For more information contact the Sony Business Information Centre: 01932 816340