blue cast to pictures
PS my wild duck cluster/NGC 6218/6281/M8 /20/M4/Dumbbell taken on the same night all have the same hue to them. Is this a facet of taking longer exposures with an unmodified camera?
Should I be thinking of investing in an OIII filter and will this work Ok on an unmodifed cam?
Another question, what's a good (free or cheap) software to use to make mosaics?
Regards
Graz
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