I have a pulsar HD-38.
It has sufficient levels of detail that I can identify deer at a 600 yards. It also has sufficient levels of detail that I can distinguish deer from sheep at 600 yards.
Due to the gradients of temperature, things which are further away than the object of interest, but at the same temperature as the object of interest, will appear dimmer in brightness.
I think thermal optics should be viewed as a companion to binoculars for animal location, but not as a standalone implement for animal location and identification.
To clarify for people, I do not have experience with any systems which mount directly to a firearm and act as a sighting system. Nor do I have any interest in these systems.
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