Hi Matt.
I think the 12" is getting up toward the upper limit of the EQ6's load capacity...but as you know Mike (and others) seem to find the mount copes OK.
I wouldn't go hanging much more off the OTA than the camera and filter wheel.
Also, I think the stability would be more suited to planetary imaging than DSO, certainly in anything other than steady conditions. You wouldn't want too much of a breeze about!!!
Cheers.
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