Free tool · UK
CCTV lens calculator
Choose the right lens before the camera goes up. Tell us the lens, the sensor, the resolution and how far away things are. You’ll see how wide the picture is, how much detail you get, and whether that’s enough to identify someone, using the DORI standard.
Field of view
85°
horizontal angle
Scene width at 10m
18.2 m
what the frame covers
Detail level
141 ppm
Recognise: you’d know someone you’ve met, and can read a plate
| DORI level | Needs | This setup |
|---|---|---|
| Identify | ≥ 250 ppm | up to ~5.6 m |
| Recognise | ≥ 125 ppm | Yes |
| Observe | ≥ 62 ppm | Yes |
| Detect | ≥ 25 ppm | Yes |
Our cameras at 2.8 mm
- 2.8 mm fixedHikvision 5 MP PIR Fixed Turret Camera£28.65
- 2.8 mm fixedHikvision 5 MP Audio Fixed Turret Camera£30.92
- 2.8 mm fixedVIPER PRO 5MP 3K Camera - 24-Hour Smart Light CCTV£36.79
- 2.8 mm fixedHikvision 4K Fixed Turret Camera£40.24
- 2.8 mm fixedHIKVISION 3K ColorVu PIR Siren Fixed Bullet Camera£42.44
- 2.8 mm fixedHikvision 3K Two Way Audio Fixed Turret£45.99
These figures use the sensor you chose above. Each camera’s page shows its real sensor size, and that matters: with the same lens, a wider sensor sees more.