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That's one of the reasons I went for the Baader MKIII coma corrector instead of the GSO version. I've read the GSO CC needs 17mm of extra back focus where the Baader one actually gives you a few mm so the difference between the two coma correctors could be as much as 20mm.
Don't worry, I'm in the same boat money wise. A decent mono camera is out of my price range, but I'm still having fun with my DSLR. At the rate I'm firing the shutter though, it will wear out soon lol.
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