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Nice galaxy image there Roger. Great image scale.
I use CCDstack and usually apart from the fact it is tediously slow with large files its quite good.
As far as rejection goes I only use hot/cold pixel rejection. Perhaps that may vary with different model cameras but my FLI cameras are so clean I find that is all that is needed. It gets rid of those little coloured dots in the background that seem to sneak in somehow in filtered imaging.
Not sure what the other rejections do. I have tried them several times and can't see any difference. Or they select way too much of the image and damage it.
CCDIS is a good addon to CCDstack as it usually gives an excellent registration.
CCDstack has been evolved gradually over the years. Apart from the CCDIS I don't think its really improved it at least for my use. In fact its a little more awkward now than the earlier versions "more sophisticated" = (more clicks to achieve the same end and more automatic stuff that fights you for control).
Greg.
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