Comparison of single exposures, using Astrodon 3nm Ha filters, from the following cameras/setups:
FLI ML16200, 8 minute exposure, from dark sky site. Using a Takahashi 130 TOA NBF refractor, on an Astrophysics mount, User 1;
QSI683-WSG8, 15 minute exposures, Stellarvue SVA 130T refractor, SkyWatcher AZ EQ6 GT mount, by User 2 from suburban Melbourne;
QSI683-WSG8, 30 minute exposures, Stellarvue SV70T, on a hypertuned Skywatcher NEQ-6 mount, from suburban Melbourne, by User 3
ZWO ASI1600 mono-cooled, 15 minute exposures, Takahashi E-130D reflector, on a Software Bisque MyT mount, from suburban Melbourne, by User 4.
High resolution jpeg source files (cropped, hence the smaller file size) available here: https://drive.google.com/file/d/0B761...