I had a wee play with a monocular last night. It wasn't a model that could range but I could clearly see sheep at night in filthy weather ~300m away that there was zero chance of being able to see with the naked eye.
I hadn't used one before but was impressed especially given it was described as "an older cheap one." (~$2k .....). I'd expect with anything half decent you'd be able to easily see animals half a km away, but probably not clearly identify them. If you're tops hunting I reckon it'd be well worth it if you have the cash to burn.
You're probably aware but it might be worth mentioning that it was very harsh on the eye, takes a minute or so for your eye to work properly after using it. Less of an issue during the day I'd expect.
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