Quote:
Originally Posted by sil
he stopped it down to get a sharper image with rounder stars. using any lens at its "fastest" is never ever the sharpest aperture to use and the amount of difference it makes not stopping down for astrophotography is a dumb idea. no matter how expensive your lens.
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Thanks for the explanation Sil. So I guess like everything, it's a balancing act between stopping down the f stop to gain sharpness but that gets negated if you have to run too high ISO and you generate too much noise. In turn you could then get a better PA and go for longer subs ? AP is a never ending mine field isn't it.... ?