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Lens Angle Comparison
The following chart displays the comparison of CCTV lens with the regular 135mm film camera lens.
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CCTV lens
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135mm lens
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| focal length | Angle | Angle | focal length | ||
| 2.5mm | 120° | 114° | 14mm |  |
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| 3.6mm | 92° | 94° | 20mm |  |
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| 4.3mm | 78° | 75° | 28mm |  |
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| 6.0mm | 53° | 51° | 45mm Standard lens for 135mm camera Regular angle of our eyes vision |
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| 12mm | 25° | 24° | 100mm |  |
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| 25mm | 18° | 18° | 135mm |  |
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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°.