Quote:
Originally Posted by gbeal
M42 (so old Pentax screw, correct?)
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Pentax screw is a 42mm thread with a 1mm pitch, the front of the QHY8 is a T-thread. That's a 42mm thread with a .75mm pitch, it's different.
Try
MyAstroShop for spacers or
Tan has a backfocus matched QHY8 to MPCC adapter near the bottom of the page.