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Approximate horizontal angles of view with various CCD chip sizes (in degrees)
Focal length	1/3"	1/4"
2.0mm	-	82
2.8mm	86	57
4.0mm	67	47
4.8mm	57	40
6.0mm	48	32
8.0mm	36	25
12mm	25	17
16mm	17	13
25mm	12	8
50mm	6	4

1/3" Economic Lens, 2.5MM, F2.0, CS Mount