With photography it's always a balance between factors -I am thinking of getting an equatorial mount to increase my exposure times without the "trail" effect. Currently the D800e body I use is for astrophotography is right at the color resolving limits of technology with 20-30 second exposures, at 1.4- 2.8 using ISO 1600. For the record the coma in your shot is minimal compared to the big prime Nikkors I have used. When wide open my 50mm 1.2 Nikkor rendered nearly every bright star with rings like Saturn - so ultimately you really need to stop most lens down and resort to longer exposures using an equatorial but then you run the risk of additional atmospheric effects and light pollution blowing the dark sky out. I am located at 45 degrees NORTH latitude!
What was the latitude for this exposure? Great use of an equatorial mount there is however a bit of coma observed on the outer edges of the frame - I wonder if this would improve by stopping down a bit?
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