Camera Guide · Tool

CCTV lens and DORI distance calculator

Name: Certified CCTV camera models in India: STQC IoTSCS ER certificates and BIS CRS security-ER list
Creator: Mama
License: https://creativecommons.org/licenses/by/4.0/

Pick a certified camera or enter resolution and field of view; the calculator shows how many pixels per metre you get at a distance, and how far the camera can detect, observe, recognise or identify a person on the DORI scale of IEC 62676-4:2014 (25, 62.5, 125 and 250 px/m) — the scale Indian datasheets still print.

Method: DORI pixel densities of IEC 62676-4:2014 — scene width = 2·d·tan(FOV/2), pixels per metre = horizontal pixels ÷ scene width. Presets from official vendor datasheets and spec pages (33 lens options); where the vendor prints its own DORI distances they are shown alongside — they are often 1.05–1.8× longer than the same vendor’s field of view implies. Note: IEC 62676-4:2025 (published 9 Oct 2025) replaced the DORI scale with seven new pixel-density levels; vendors have not switched yet. Geometry only: lighting, compression, IR range and mounting height cut real-world distance. Last verified 15 Oct 2026.

Horizontal pixels · horizontal FOV (°) · distance (m)

Reading the result for a factory floor

For counting machine idle time and people at a station, Observe (62.5 px/m) is usually enough; reading a label or a face needs Recognise or Identify. A wider lens covers more floor but each metre gets fewer pixels. Certificate status for each preset is in the certified camera finder.

Want a camera plan for your floor? Mama will get back to you.

Free · no obligation

Get a camera plan for your floor

Tell Mama about your plant and Mama will come back with how many cameras you need, where they go, and the retention your state expects — sized to your floor, in ₹. Built for Indian factories.

How many cameras & exact placement
Compliance-ready (BIS/STQC, women's night shift)
Honest ₹ estimate — guard vs camera-AI