This is my first project completed using the AP CCDT67 telecompressor with my RC8. I'm using it at 0.75x reduction factor, which brings me down to f/6 (1226mm focal length). I've got 60mm of backspacing behind the telescompressor (which includes my EFW and OAG). The telecompressor adds 16mm of backspace with its own nose piece (this confuses a lot of people). So technically, it has a total of 60+16mm = 76mm of backspacing to the sensor from the glass of the telecompressor.
I'm impressed so far. The corner stars aren't perfect, but it almost corrects the entire FOV on an APS-C. Here's my initial test shot (60s):
https://i.imgur.com/ObB9XzF.jpgFor the M51 project, here are the acquisition details. The edges are only slightly cropped to display most of the FOV:
Bortle 7
L = 4.1 hrs (120s subs)
R, G, and B = 1 hour each (120s subs)
Ha = 7 hours (300s subs)
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