Quote:
Originally Posted by gbeal
Got me confused Marc, easy I know. @', M42 (so old Pentax screw, correct?), in lengths 10mm to 40mm? What are you after.
If M42 Pentax extension tubes, try e bay or a second hand camera store. I have a couple lying round, others will too.
Gary
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Hi Gary, how's sunny NZ?
I want something between my MPCC and the QHY8 nose piece that I can adjust so I can modify the coma corrector spacing. I have one spacer right now that's about 35mm in length with one male thread M42 that goes into the nose piece on one end and 42mm female on the other end to fit the back of the MPCC. Counting the total length from the back of the MPCC to the CCD plane I have exactly 55mm +/- .5mm. I want to be able to modify this distance to check if it improves the field at all.