First one had spots in the glass. - Burris BTS 50 3.3-13.2x50mm Thermal Rifle Scope

Easy menu allows for fast friendly adjustments. The scope is nice for the money. I'll say that I can distinguish animals from one another out to about 250 yards. But after that edges of animals are blurry and the deer ears start to look quite round and edges are more smooth and not crisp. I bought this scope and a clip on. Both scopes had a lot of imperfections within the glass itself. I noticed it when I had it on black hot, and was looking at our wood burning stove 15ft away. I also noticed it when I was looking at deer just below the top of a ridge line. The sky behind them looked a bit blurry within certain areas of the glass and that's when I realized I could see the imperfections. I've sent both units back and waiting for the replacements. Hopefully the glass will be clear! If not, they'll be sent back and I'll just get a full refund.