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I am having the opposite problem at f4 - same answer though. As Marc says, if the main camera is in focus, the guide cam will be as well if the distances to the 2 focal planes are the same. Just looking at your setup picture, provided the main camera focuses, you need to put a fair bit of an extension into the QHY side to push that focal plane further out. anything that you change in front of the OAG will not fix the problem.
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