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C-Mount
Security Camera
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watch the world around you
C-Mount
Camera: The
advantage to a c-mount camera is that the lens can
be changed. If you need to see further than 35 or
40 ft then you'll need a c-mount camera with a
special lens. C-Mount lenses are available from
4mm to 50mm. A 4mm lens provides facial detail and
a 70 degree angle of view focused up to about 35
ft. An example of where you might use a fixed 4mm
lens is in a small office, or at home to focus on
your driveway.
A higher millimeter lens
will provide further distance, but narrows the
field of view. So, a 16mm lens would provide about
a 15 to 20 degree angle of view at a focus
distance of about 35 ft (or a 70 degree angle of
view at about 140 feet). In general, a 8mm lens is
like a 4mm lens zoomed in 2 times. Similarily, a
16mm lens is like the 4mm lens zoomed in 4 times.
Many
times, the best option is to use a varifocal lens.
This will allow you to vary the focus from 5 to
50mm. So when you install the camera you can fine
tune the focal distance and angle of view. An
example of where you might use a varifocal lens is
outside (or inside) a large commercial building
where you need more distance than 35 ft. and the
varifocal lens will allow you to adjust the focal
distance to your preference.
If you want
to use c-mount cameras outside, you must put them
in an outdoor camera housing.
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