hello,
Leo triplet taken with a 150-mm f/4 newton and coma corrector, 74 x 60s.
I'm discovering more and more fuzzy points in the image despite the strooonng light pollution. Some are clearly spiral galaxies viewed almost side on, other are less easily identifiable elliptical galaxies or spiral galaxies viewed edge on. Reliable identification is made with the help of Aladin (Centre de Données Spatiales, Université de Strasbourg). Unfortunately astrometry.net is off line at this moment.
Stacking with DeepSkyStacker with median method. Some background gradient remains because of variation in height during the exposures and absence of clean flat frame (my fault).
The limit magnitude is 18.5, that is equivalent to viewing through a 1.7-meter telescope.
You can't imagine how much the signal is shamefully amplified with the help of PhotoShop, anyway the Fixed Pattern Noise is barely detectable. My Canon and Nikon DSLRs are retired from now on.
Nicolas
Binning=1
Capture Area=4944x3284
Colour Space=RAW16
Hardware Binning=Off
Turbo USB=80(Auto)
Gain=350
Exposure=30
Temperature=3,7
Cooler Power=0
