Quote:
Originally Posted by sharptrack2
Since I haven't attempted a galaxy yet, this seemed like a good candidate, especially since I managed to find it by star hopping and have reasonably good polar alignment. Just cannot seem to get the Go-To accuracy everyone else seems to get using an HEQ5 Pro.
Anyway... Bresser Messier 127 f/5 on an HEQ5 Pro, unguided, Nikon D7200, ISO 640, 30 1 min subs, 20 ea. darks, flats and bias. stack in DSS, processed in PS.
Other than slightly out of focus, and really bad coma, does anyone see anything else I should be addressing?
Thnx in advance!
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What are your PS skills like? Simple fix: grab the lasso tool, run it around the perimeter of NGC 253, feather the selection with about a 10 pixel feather, then select inverse. You now have a rough mask that will effect everything apart from the galaxy. Now go to selective colour, choose the blue colour and slide the cyan and magenta to the left and the yellow to the right (you could even side the black to the right as well). You should see the blue halos around the brighter stars disappear, or at the least, become more neutral. Hope this helps.
Unfortunately, fast achromatic refractors all suffer CA to some extent, I have tried filters to correct this but they ultimately change the overall colour balance too much.