Quote:
Originally Posted by Tandum
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. |
I currently have peter's MPCC adaptor but I'm after something I can set to different distances.