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Old 28-12-2019, 03:00 PM
etill (Elliot)
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Location: Melbourne
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Gabriela Mistral Nebula and Gem Cluster

Last night in the South East of Melbourne seemed ok at first, but it ended up pretty hot most of the night and quite bright even without the moon.

I think I have got the setup of the mount and alignment worked out now, I was able to do 180+ seconds unguided without elongation of stars, but the images looked pretty terrible. I thought maybe the exposure was too long so I went back to 90, but these also looked terrible. I have a feeling it was the heat as the camera was claiming between 30 and 34c for each exposure.

Last week it was close to 24c for most shots and a similar part of the sky, but since this is really only my second attempt it could be anything..

How much difference does 6 to 10 degrees make to noise?

I think I got rid of the noise ok with pixinsight, but it has started to look kind of over done and is still pretty grainy.

I managed 29 x 90sec ISO 400 shots
30 Dark, Flat and 60 Bias (using SuperBias again)
Vixen R200 F/4, CGEM mount and an unmodified Canon 60D with Baader MPCC.
All processing was pixinsight.

I'm still not sure which way is supposed to be up, so I just leave the camera in the scope the way it is in case I can reuse flats.

I have a bunch of NGC55 images to do next, but it was sitting right above my tin roof so I'm not holding my breath for those.
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Old 12-01-2020, 09:05 AM
Paulyman (Paul)
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Not sure why this has no comments, perhaps it got missed in the Christmas and new year break. I think you have done a good job given the conditions. Some of the gurus on the Cloudy Nights forums mention noise doubling every 6 degrees. So a change of 6 degrees would be quite noticeable as you have seen.
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Old 12-01-2020, 09:49 AM
spiezzy
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looks pretty darn good to me Elliot nicely framed to be great to see your images of NGC 55
keep them coming vey impressed
cheers Pete
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Old 12-01-2020, 11:21 PM
Fernando
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So beautiful!
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