I have used mine in the bush quite a bit (25mm lens/640 sensor). Bloody effective. I stalk just as I normally would but every now and then scan with the thermal, just as I would with binos. Amazing what I have picked up that I'm sure I wouldn't have detected without it.
The thermal doesn't know if it is daylight or dark. It senses difference in temperature. A warm body in the cool bush stands out just fine but they really come into their own in winter when an animal will stand out like a light bulb in a dark room. The biggest problem I then have is seeing the bloody thing without it, even though I know exactly where it is.
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