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Using Infra red illumination particularly at night, will produce very reasonable images indoors, but its important to note that this type of filtered camera set up will rarely work under fluorescent lighting (simply not enough Infra Red light to produce a useful image).
If this route is to be adopted, the ideal arrangement is to provide 850 - 1000 nM. Infra Red uplighting so that the room remains black, whilst the IR diffuses down from the ceiling, to produce a clean evenly lit image, with no harsh shadows.
This technique is particularly valuable in office environments and computer suites, where a lot of shrinkage tends to occur outside of normal working hours.
If a particularly large area is to be covered, the approach Doktor Jon would take, is to align a CCTV camera looking along the main corridor to produce evidential quality images of all pedestrian movements, and additional cameras located to provide wider angle views; in the event of an incident being recorded on the wide angle camera, the suspects identity can then be verified using the corridor camera.
Wherever the camera is intended to be installed, the simple rules are, it must be firmly secured against any vibration (not next to an air conditioning unit), not positioned where it could overheat (i.e. beside a heating duct), and ideally .... somewhere where it will not be found!!
Follow Doktor Jons simple advice and hopefully the results should speak for themselves.
Oh and try not to take too long otherwise the secret may be out!!
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