Thanks SkyPup, as you well know, I'm just an amateur. I will have to do more tests ... because the thermal sensitivity is very high and this is not good in these hot nights. You have to decrease the contrast level a lot in order not to have images only in black and white without any intermediate shades of gray ... To better observe the details and for the PID of the targets, a small amount of gray is always necessary. Now the problem of 30mm rings has also arisen ... I absolutely do not want to crawl or mark the device tube. Maybe there are felt pads to be placed between the rings and the tube itself? Last thing ... Two 30mm Leupold semi-quick release steel rings could be fine to mount the scope on the Picatinny rail? But do I have to buy 2 straight rings, or one must have the cantilever shape, to move the telescope back so that I can more easily bring the eye closer to the rubber bellows of the eyepiece?
One thing is certain ... Kirsch and Skinney certainly have far fewer installation problems than I do. Their Bering SH and Infiray Rico MKII (or RH50 ...) thermal riflescopes attach quickly and easily to any Picatinny or Weaver rail.