For astrophotography of deep space objects like galaxies and nebulae, I would say little is to be gained from better than 2 arc-sec per pixel. Even at 2 arc seconds other factors play a significant role in useful resolution. How stable are your skies? What size aperture is your scope. How good is your mount over the integration period? How good is your alignment? 2 arc seconds is a rule of thumb. It is doubtful that around Syracuse that the sky is better than 2 arc-sec and you can’t correct for it – without adaptive optics. A 4″ aperture scope […]
Richard Kellogg
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