Focal Length and Angle of View

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gurinder dhiman

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Aug 22, 2010, 7:31:32 AM8/22/10
to SecuritySystem
Focal Length(FL) is the distance from the center of a lens to the
focal point (CCD sensor chip). FL, as well as the CCD chip's format,
is the major factor to determine the angle of view of a lens. For
example, a 6.0mm FL lens on 1/3" sensor format has 56.8 degree of
diagonal angle of view and a 5.0mm FL lens on 1/3" sensor format has
66.9 degree. But, the same 6.0mm FL lens can see 75.5 degree on 1/2"
sensor format. The angle of view also varies a little depending on the
manufacturer of the lens.

For 1/3" CCD chip camera, the following formula is a simple way to
determine the focal length of a lens needed.

(Distance to subject / Width of subject) x 4.5mm = Focal Length.

For example, if you want to watch a subject of 5.5ft width at 10ft
distance with a 1/3" CCD camera, you will need a 8.0mm FL lens. That
is, 10ft / 5.5ft x 4.5mm = 8.18mm. A 8.0mm FL lens mounted on 1/3" CCD
camera will cover the subject you want to watch.

Amit Amarpuri

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Aug 22, 2010, 10:42:17 AM8/22/10
to gurinde...@gmail.com, SecuritySystem
What the hell is going on.

Please have you private conversation in private. Please do not irritate us &
flood our mailbox with your private discussions.


Sincere Regards,

Amit Amarpuri

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