In general we prefer to fit fixed lens cameras having first identified needs, but where the client may move camera locations from time to time it is advisable to suffer the cost penalty and install vari focal cameras.

Vari focal dome cameras have adjustment screws either side of the eye (illustrated) to allow adjustment of focal length typically between 2.8 wide angle and 12mm (see page showing lens effects). This makes the camera slightly more complex and almost doubles the price of an equivalent fixed lens camera. We still prefer to utilise High Definition cameras with at least 1/3" CCDs and a minimum of 600 TVL (Television Lines resolution) and as technology progresses we will most probably move to using 700 TVL and higher as our base standard. 

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