Lens Angle Comparison

The following chart displays the comparison of CCTV lens with the regular 135mm film camera lens.

CCTV lens		135mm lens
focal length	Angle	Angle	focal length
2.5mm	120�	114�	14mm
3.6mm	92�	94�	20mm
4.3mm	78�	75�	28mm
6.0mm	53�	51�	45mm Standard lens for 135mm camera Regular angle of our eyes vision
12mm	25�	24�	100mm
25mm	18�	18�	135mm

Canon-USA has a visual comparison chart of their lens.
Please visits them. It is fun to find out how wide is 120� or 18�.