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It's the kind of thing I looked up and learned about whilst I was buying them, but now that I've bought them I have basically forgotten. It's just "big monocular" or "small monocular"
I am glad I have them though, obviously you're not doing anything crazy but I have had great and memorable moments looking through them, like this kingfisher I saw once.
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Belagerent
MisterMikkel
Which is excactly the kind of opinion I was hoping for - that 25mm aperture is adequate.
Because the ex-photographer in me thinks a larger aperture is always better, but none of the sites I've found are able to quantify/provide information about light sensitivity across a range of say 10x25, 10x32 or 10x45..