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Hi Stu,
Yep, I have the same issue with the 2" adaptor and the MPCC, the 2" adaptor is too tall and the DSLR cannot reach in-focus. I think I may have to try cutting down the collar mod.
Here is an example of the coma experienced on my 8" F5 scope into the DSLR, you can see how much of the screen shows coma, from about 50% to 60% off the middle, the stars blur like a zoomed shot.
Taken last night (read, this morning at around 5am) when testing my guiding using the toucam through the finder and PHD (got it working though! - woohoo, took some 5 minute shots with NO trailing)
This is a simply a 60 sec sub of the Eta Carinae Nebula showing the Homonculus.
Forget about the quality of the shot, there is a lot of work and fine tuning for me to do yet, but I thought I would post it to show you what the problem is when using the 1.25" adaptor screwed onto the T ring (gets focus OK) but shows a LOT of coma in the outer half of the image.
Keep this in mind. I have an MPCC and tried to use it last night, but was about 15mm from reaching in focus on the focuser, so the collar cut down is the most likely route I will take to bring the MPCC into play. Then, look out!
Cheers
Chris
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