No, not the flat flange. Download an updated manual. The original manual had an error that Celestron have since corrected in the online version. You need to measure from the very back of the reducer (back of the lens housing). The difference is 5/8". See the attachments.
The incorrect reference position is in red, the correct one is black.
Last edited by frolinmod; 02-12-2012 at 03:00 AM.
Reason: spelling
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