Lens is one of the necessary device in cctc system. In practical application, to select a suitable lens to fit the camera need to take the environment and customers` needs into consideration.There are different types of lens in the market. In terms of focal length, lens can be devided into short focal length, medium focal length, long focal length and variable focal length lens. In terms of viewing angles, lens can be devided into wide, standard, and long viewing angles lens. While in terms of structure, lens can be devided into fixed focus iris lens, auto iris fixed focus lens, manual iris manual variable focus lens, auto iris manual focus lens, auto iris electrical variable focus lens and electrical 3 variable focus lens.Types of lens:1. Fix iris fixed focus lensBecause of the fixed characteristic of iris of Fix iris fixed focus lens, is cannot be adjust, this type of lens is usually used in environment with unifoum illumination, such as indoor environment.2. Manual iris fixed focus lensManual iris fix focus lens generally has a Focal length range from F1.2 to F1.4 or shut off, it is easily adpat to environment with different illumination, however, since the iris is adjust manually, once the camera installation is completed and the location is fixed, iris is not easy to regulate frequently, so, this type of lens is usually used in environment with uniform illumination, while in other environment, CCD camera with auto electrical shutter is needed.3. Manual Variable focus lensRegulation of focal length of Manual variable focus lens is capable in a fixed range, the variation is about 2 - 3 times to general lens, general focal length is about 3.6 ~ 8mm. In practical application, through adjustment of variable focus iris, it is easy to select the viewing angle for monitor.4. Pin-hole lensPin-hole lens is generally fixed focus lens, so pin-hole lens is relatively with a smaller aperture, and so constitute lower quality image of camera. Low-illumination typed is more suitable for cameras with pin-hole lens.
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