CCTV Visual Lens Comparison Chart |
The following chart displays the comparision 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 |  |  |
| CCTV Technical Lens Comparison Chart |
| Indicates total viewable area (WxH) at a given distance based on focal length used |
| Focal Length | 5' (WxH) | 10' (WxH) | 20' (WxH) | 40' (WxH) | 50' (WxH) | 100' (WxH) |
| 2.5 mm | 9.4x7.1 | 19x14 | 38x28 | 75x57 | 94x71 | 188x142 |
| 2.9 mm | 8.6x6.4 | 17x13 | 34x26 | 69x51 | 86x64 | 171x129 |
| 3.6 mm | 6.9x5.1 | 14x10 | 27x21 | 55x41 | 69x51 | 137x103 |
| 4.0 mm | 6.0x4.5 | 12x9 | 24x18 | 48x36 | 60x45 | 120x90 |
| 4.3 mm | 5.7x4.3 | 11x8.6 | 23x17 | 46x34 | 57x43 | 114x86 |
| 5.5 mm | 4.5x3.4 | 9x6.8 | 18x14 | 36x27 | 45x34 | 90x68 |
| 6.0 mm | 2.0x1.5 | 4x3 | 8x6 | 16x12 | 20x15 | 40x30 |
| 8.0 mm | 1.5x1.1 | 3x2.3 | 6x4.5 | 12x9 | 15x11 | 30x22 |
| 12.0 mm | 1.0x0.7 | 2x1.4 | 3.8x3 | 7.7x6 | 9.6x7 | 19x14 |
Use your 35mm camera and this chart to help make your lens decision.
| 35mm to CCTV Focal Length Conversion Chart |
35 mm | 1/4" | 1/3" | 1/2" | 2/3" | 1" | Angle |
10 | 0.9 | 1.4 | 1.8 | 2.5 | 3.7 | 120.6 |
35 | 3.2 | 4.8 | 6.4 | 8.8 | 12.8 | 53.2 |
60 | 5.5 | 8.2 | 11.0 | 15.1 | 22 | 32.6 |
85 | 7.7 | 11.6 | 15.6 | 21.3 | 31.1 | 23.3 |
110 | 10.0 | 15.1 | 20.1 | 27.6 | 40.3 | 18.1 |
135 | 12.3 | 18.5 | 24.7 | 33.9 | 49.4 | 14.8 |
160 | 14.6 | 21.9 | 29.3 | 40.2 | 58.6 | 12.5 |
185 | 16.8 | 25.3 | 33.9 | 46.4 | 67.7 | 10.8 |
210 | 19.1 | 28.8 | 38.4 | 52.7 | 76.9 | 9.5 |
235 | 21.4 | 32.2 | 43.0 | 59.0 | 86.0 | 8.5 |
260 | 23.7 | 35.6 | 47.6 | 65.3 | 95.2 | 7.7 |