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Marc,
I am not using the standard focusor though. I bought a feather touch and had everything sorted when I was imaging with the 40D. The extension setup was quite different to how I have it at present with the QSI. Certainly check for optical alignment is a must and I will be putting a catseye collimation cheshire over the back of the scope to see if everything is concentric. You raise an interest idea though that everything can be a little out and create a large problem. The compression ring on the feather touch is not likely to be out, but still worth checking though.
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