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Thanks Pat and Raymo.
Overall I am pretty pleased with performance of the RC6, only had to tweak the secondary collimation slightly out of the box to get a good field. Perfect focus is hard to achieve but on this night just seemed to snap, so I kept imaging till the trees got in the way. I'll have to try longer subs, now that I seem to have the autoguiding working well on a regular basis, but my biggest stumbling block is the lack of cloudless nights and winter is supposed to be the clearest here in the tropics? I am using a 1100d unmodded as my imaging camera which seems to do a good job, less noisy than my newer 1300d. I have been shooting at iso 1600 and 2 min subs which seems to be the best compromise for this setup.
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