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Posted: Fri Dec 23, 2016 2:59 pm
by DRatledge
What is the difference between a 12-inch telescope with a cooled CCD camera and 4-inch with an uncooled Canon DSLR? Below are two equal total length exposures (5 hours) of the Pisces Cloud Galaxy Cluster - they were shot simultaneously.

The 12 incher + CCD has reached at least magnitude 21 and the 4-inch + Canon mag 18.66. Quite an amazing perfomance by a DSLR and 4 inch scope. I used Aladin to check the magnitudes. .