I just received a Hogster 35mm and only had a chance to play with it for about 20 mins. So far, this this is everything that @KoreyKirsch and @NGI_TOM said it was. I was scanning around my neighborhood and was surprised at the clarity. Especially when it was a couple hours past sundown on a hot, humid, night. Cars still glowed hot. It was easy to spot rabbits, cats, raccoons, and possums, as they prowled around the neighborhood. The farthest I was scanning was probably about 400yrds out to the main road and could tell what was a car, suv, or truck without issue. If you're looking for an affordable thermal, give Night Goggles a call and talk to Tom about your questions.
One thing I would like to see in the instruction sheet are tips on how to zero. I read some where that putting a piece of tin foil over the center of the target will make it glow for zeroing. Is there truth in that?