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Thanks for all the above gents.
As a couple of guys have said, the focuser isn't adjustable.
The eta image was shot with a 2 inch nose piece on the QSI into the Tak 2inch adapter (I was waiting in other adapters to arrive).
I have seen some tilt in my DSLR shots that were taken with rigid screw in adapters, hence my suspicion that the collimation is out. It is always in the same corner of the frame and I think I have had that camera oriented in the same direction for all of the shots I took. As the scope would have been oriented in different directions, I would expect that gravity would have caused the elongation to move around the frame if the focuser was drooping.
Regardless, I'll try some star tests when I next get a chance to set it up and go from there.
Thanks again for the advice,
DT
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