This is?an update to my original issue/post of a brand new C11 EdgeHD giving unacceptable star trails, with under 5min exposures, using a piggyback guide scope.
As is to be expected, Celestron needed to be convinced that it is the scope that is the problem,?and not all the other reasons a piggyback tracking system?can cause a?similar appearing?outcome.
Images of?defocussed stars going in and out of alignment as the OTA?went from?zenith?to near horizon?got their attn. but no RMA. They weren't large shifts, just unmistakable.
Pointing out dust motes moving about the x/y location on the?image, as the scope moved about,?got no comment, although I thought it was much more convincing than defocused stars, And more measurable too..
Comparing a Meade image to a Celestron image, with the only difference being the OTA's, got nothing.
Explaining that I've been imaging for well over a decade, I know what?I'm doing, and talking about, ...?with a web?site full?of evidence to show, got no comment
What seemed to work, besides perhaps persistence, was the following
Starting 10 arc min past zenith I took consecutive images over 1/2 hr with my guide scope piggybacked?on a high?quality refractor. ?I put the focuser and camera that I use on?the C11, on the refractor. I demonstrated under 5" deviation, RA & Dec, from the ideal track, for the entire 1/2 hr.
I then repeated the above, substituting the C11 for the refractor, first?at f10, and then with their focal reducer at f7. It showed the same amount of?image shift at either FL.
As a final touch, I tracked for an hour, demonstrating that?the image?shifted along the ?same arc as the OTA took, as it tipped and rotated from nearly vertical, westward along the RA track.
That seems to have done it. I'm now waiting for the RMA process to play out.table?star trails,?at well
