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What OAG for my setup

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I am looking at introducing an OAG to my current imaging setup. I use an Atik 383l plus Atik EFW with a skywatcher aplanatic coma corrector with a 10" skywatcher Quattro.

The obvious choice would be an Atik OAG but with only 55mm of back focus available on the coma corrector I assume I'll need a narrower OAG.

Any help/advice would be great appreciated.



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    • By Callistarus
      I'm sure this is just one of many hundreds of posts about correct spacings on here - I think I've just about got it but I need to confirm a couple of things with folks who have more experience than me on these matters.
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