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I initially put a cheap 1.25" diagonal in it to achieve focus with my qhy5. Since then I have put a camera rotator on it with a flattener and attach the qhy5 directly to that via a cheap M52 female to M42 male adapter I got off ebay.
I think it's a 52mm thread on the flattener, might be 53mm, can't remember, nor did I worry about distances to the flattener as I was only guiding with it.
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