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Hi Paul, Thanks I think it turned out ok, The tube had not cooled when I did this so the pointy tail is a hot mirror later shots don't show this but this was the best image I did of 5128 last night, I checked collmination throughout the night and it does change slighty as the mirror cools.
The apparent field rotation was my fault I used the wrong spacer distance between the DSI and the F3.3 reducer,with the right distance between them there is no field rotation or coma as in this case I found this out later last night also.There is also a little bit of star trailing in this as well, the mount wasn't tracking as well as normal
I find like the LPI, the DSI is easy to use, the problems start when it's time to do the processing, still so much to learn :-))
David.
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