Quote:
Originally Posted by garymck
What spacing are you using for the Celestron focal reducer? I've used one on a C8, C11 and currently on a C925 without any problems. The correct spacing is 105mm.
Gary
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I’m currently at approx 110 but have had the issue from 90mm-120mm.
I’ve done away with my OAG for now to attempt get more range and take subs from 80mm. Have read that at about 85mm the reduction is approx 0.7 and many have found a flatter field there.
There is so much debate in countless forums about this reducer but I haven’t found any that have quantified the curvature using CCDI.