Years ago I played with the idea of a folded refractor, as per the attached. It worked, but...
I'm hoping someone has an unused 90mm ~ 102mm, F7 ~ F10, objective sitting out in the shed?
Unloved, looking for a new home, wants to be played with, you know what I mean! I have an urge to tinker!
Just an achromat, I'm hoping not to pay too much
I've been scanning ebay, Marketplace, Gumtree etc. for something but nothing much around it seems.
Please PM me if you can help, ta!