gain changes the focus of the beam....this changes the return, hence affecting the color calibration you see.
in addition, the issue of air density, and backscatter from the sidelobes.
think of it as a distant similar to driving with your low/high beams on in fog.
as noted by several posters, attempt to correct this with software can lead to missed detection.
Last edited by underfire; 11th Feb 2018 at 16:40.