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Ok, I've done some reading and can see the advantages of OAG. However I have to consider focus distances and vignetting more now if I understand things correctly.
Currently, from the back of the scope, I have a 50mm spacer, the focuser, then the 40mm diameter camera adapter, then finally the T ring to the camera. I was already concerned with the vignetting I was getting, so I had ordered the True-2 adapter (with a clear filter) from telescopeadapters.com to help with that. That's currently on its way to me. However I suspect the OAG replaces (some of) these bits?
I now need to work out a solution for these requirements:
* OAG that limits vignetting
* OAG that works with/without Focal Reducer (do I need a FF when no FR is in use?)
* Working out how to get my 2" 0.5 FR to focus
It's a bit of a puzzle to put together. Any ideas on possible OAGs that I should consider (going with the ST-i)?
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