Resolution and lens
- Sensor resolution: 256×192 is entry; 384×288 mid; 640×480+ for longer-range clarity.
- Lens FOV: Narrow lenses see farther but with less field of view; wide lenses see more, less detail.
Refresh rate and smoothness
- 30 Hz is fine for scanning; 50–60 Hz helps when panning fast or tracking moving targets.
- Higher refresh draws more battery—carry spares or power banks.
NETD and detection
- NETD (sensitivity): Lower mK values mean better contrast in fog, drizzle, and small temperature differences.
- Detection vs ID: Specs often list long detection ranges; actual identification range is shorter. Match expectations to lens + resolution.
For balanced picks at different price points, see our Night Vision & Thermal Imaging guide.