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Hi Mike,
Yes I am in the same situation with my CDK17 when I use it with a reducer. I don't have enough backfocus for an OAG so I use a top dovetail mounted Vixen 95VMC and an ST402ME.
That works well but I do find the occasional subs that have elongated stars.
Overall I find the OAG solution the most effective though. That is really reliable in giving the roundest stars so far for me.
Greg.
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