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Fixed Iris lenses with fixed focal length are the least expensive and the most widely used.
CCTV security cameras that are used in good and constant light conditions (e.g. indoors with electric lighting) will perform satisfactorily with a "Fixed Iris Lens".
Tips:
All of our cameras incorporate an Electronic Iris facility, this allows the use of manual and fixed iris lenses in changing light conditions, with this technology the light level is adjusted internally by the camera, in bright conditions the picture is darkened to give you a clearer image and as the light level drops the picture is brightened.
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