I had my doubts when I ordered this thermal imaging monocular, but after conducting some thorough tests, all my concerns were put to rest. I used it to observe people at a distance of 150 yards, and I could clearly see their movements and distinguish their actions. The 15mm lens really delivers great results. Close up, it performed just as well; I observed my Golden Retriever, and the clarity was stunning—I could even see the details of his fur. Impressively, when I filled a cup with hot water, it clearly showed the heat distribution within the cup. I'm eagerly looking forward to using it on my next hunting trip. This was totally worth the buy!