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lens information
Approximate Horizontal Angle of View
Lens Aperture |
Lens Diameter |
|
1/4" |
1/3" |
1/2" |
2.8mm |
64° |
80° |
97° |
3.5mm |
51° |
68° |
84° |
4.0mm |
45° |
60° |
74° |
4.8mm |
38° |
40° |
69° |
6.0mm |
30° |
38° |
57° |
8.0mm |
23° |
30° |
40° |
12.0.mm |
15° |
20° |
30° |
12.5mm |
14° |
19° |
28° |
16.0mm |
11° |
15° |
22° |
25.0mm |
7° |
10° |
14° |
50.0mm |
4° |
5° |
7° |
75.0mm |
2° |
3° |
5° |
Wide Angle |
Standard Angle |
Telephoto |
Much confusion has been caused by the introduction of new lens and camera technologies to achieve the correct setting of the iris for a given light level. Manufacturers use the same term for different systems.
A lens that takes a video signal reference from the camera. It uses this in an amplifier to deliver a DC voltage to open or close the iris aperture. The video level control is part of the lens.
A lens that takes a reference DC voltage from the camera to open or close the iris aperture. The video level control is part of the lens.
This is a camera that used its electronic shutter to control how much of the light falling on the CCD sensor is used to produce a picture. Thereby emulating the iris control of the lens. Video level is normally factory preset.
Is the method by which the small DC voltages produced by either AI or DD systems are converted into movement of the lens iris. It is a modern cost effective alternative to the servo drive method. It is used in both AI and DD lenses.
Standard: Typical horizontal angle of 30 degrees. A "normal"
angle of view is similar to what we see with our own eyes and is approximately equivalent to the diagonal dimension of the CCD imager.
Wide Angle: Typical horizontal angle of 64 degrees. These are short focal length lenses which provide wide angle views.
Telephoto: Typical horizontal angle of 15 degrees. These are long focal length lenses that provide high magnification.
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