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All you need to know about lenses,
Apart from the miniature barrel type lenses mostly used on Printed Circuit Board cameras, and specialist optics like pinhole lenses, the majority of interchangeable C (and to a lesser degree CS ) mount optics on the market, will accept a wide range of front mounted filters.
Perhaps the main reason why filtration is rarely if ever used on CCTV cameras, is a glaringly obvious one - hardly anyone knows what filters are available, and how best to use them.
And yet the basics are in fact very straightforward.
There are essentially three main groups of filters that can be used in CCTV work, although in addition, a handful of specialist filters could be considered for mission critical applications.
Despite the name, these most definitely do not come in cube shapes.
It may come as something of a surprise, but without the humble block filter, most colour cameras would be producing some quite extraordinary images. If you remove the lens from a colour camera and look straight at the imager, youll hopefully see a blue coloured filter inside the camera. This block filter is specifically designed to cut out almost all Infra Red light from reaching the imager, as this would dramatically effect the overall colour accuracy of the picture.
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