Quote:
Originally Posted by Merlin66
Carlton,
The Celestron paper refers to the EDge design not the CPC design.
The standard backfocus would be 125mm from the rear cell.
If a x0.63 reducer is used the backfocus is 110mm
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Doh!!... my mistake... for some reason I thought I read he had the EdgeHD... possibly I conflated the OP & the first response...
Thanks for pointing that out Ken... I'd hate to steer someone down the incorrect path..
Cheers