How does a neutral density filter affect the scene dynamic range of FLIR’s OEM cameras?

Scene dynamic range is inversely proportional to the transmission loss introduced by a neutral density (ND) filter.

For FLIR’s standard OEM cameras:

*Lepton radiometric, only.

Introducing an ND filter with X transmission will increase the scene dynamic range by a factor of 1/X, assuming that the photon contribution coming from the filter itself is negligible.

For example, with a 0.65 ND filter, a Tau2 640 could potentially see up to 550 °C/0.65 = 850 °C in Low-Gain mode.