I need a bit of help working out what this item is please.
It was with a large selection of filters etc.
Seems to "slip" over a 22mm opening ("about" 22mm).
There is a fixed lens on one end, with a square "iris" above that, in the middle. Then there is a small "eyepiece" in the top, a push-pull slip fit, with "2" on this eyepiece.