I've tried a low-end device and can offer a few comments:
* It's hard to see things because the depth of field is so limited.
* You're staring at a small, glowing light which messes up your night
vision entirely.
* It's pretty hopeless to scan the environment looking for animals through
a very narrow tube.
* If you can find an animal, some are clearly less disturbed by the
infrared than a torch. Yellow-bellied Gliders are very shy of visible light
but don't seem troubled by this part of the spectrum. Someone posted some
brilliant Glider films here a few months back from down this way (NSW Far
South Coast.) Perhaps whatever videocamera they were using is a better
alternative?
If you're staking out an owl hole or the like, it can be worth setting up
this sort of gear on a tripod and then using a torch to quickly detect if
an owl is around. If so, you can turn on this gear to get a look.
I'd love to try out some high-end gear and see what it's like.
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