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Sorry, I should clarify. The SCT adapter part of the Celestron OAG threads onto the end of the reducer. I had counted 105mm total back focus including the full length of that adapter piece. But, because it threads onto the reducer, it is effectively brought “inwards” because the end of the reducer is now inside that adapter piece.
Hence why I tried adding a couple mm, however that didn’t seem to work. The next clear night I will try removing the oag and using the t adapter. I also need to find a way to upload my Fit files to illustrate the issue better, but they are 22MB each.
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