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OAG back focus question
l'm intending to put an OAG on my refractor (svbony 102mm with 0.8 reducer). l currently have a svbony filter drawer (21mm) and cam is a asi533.
ls my only real option the zwo oag, which is 16.5mm and would replace the existing 16.5 spacer?
My preference would be the askar oag which is 19.5mm and has an integrated helical focusser but don't know how to get around that extra 3mm?? l don't want to remove the reducer
Back focus is 55mm btw......
Last edited by redeye64; 16-03-2025 at 04:59 PM.
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