Yea i was surprised too. You can easily ID a person at 400m with the standard zoom (lowest/default is 2x) but then with the screen-pinch type zoom you can still ID them out to around 600m. After that they become just a blur of pixels but even that is useful if just looking for any heat signature. Of course a smaller target would be identifiable at a smaller range - i'd expect a deer sized target should be good for around 300m. And of course they take next to no room in a bag and weigh almost nothing too. I've put some velcro on mine and then some of the phone case and it'll just sit there as i scan. I'm not sure of the drain on the phone battery but i always carry a small powerbank anyway.
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