I suck at clues... So far we've had the round bit is 30-40mm across (guesstimate), and that its part of another hobby that often overlaps with photography...
Ermmm... It's not a toy, nor cheap, and they come in various sizes.
It is infact the focuser wheel from my mahoosive scope. 200mm wide and 1200mm focal length. Combined with the dark skies in the new forest, it has shown me some wonderful things!
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