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How can I measure the Focal Length of my cameras?

The Focal Length is measured in mm. As a guide, a short focal length (e.g. 2.5mm) = a wide angle of view a long focal length (e.g. 16mm) = a narrow angle of view the smaller the CCD Chip - the narrower the angle of view

1 / (Object Distance) + 1 / (image distance) = 1/ (Focal Length)

Thanks. Do you have a link where I can learn more about that?

This should help: http://www.2mcctv.com/lenscalculator.html

Great! Thanks.