12-10-2017, 12:16 PM
I think you misunderstood me, GoldRingNikkor, 
I think, it's literally impossible to get a 14 mm lens with that aperture at the same time doing extraordinary things with test charts at test chart distance and doing well wide open at infinity. Like you said, night sky is one of the fields for it - and unfortunately, if you check it's corners, sharpness is there, but coma as well (butterflies instead of pin points).
All I was saying is that for these kind of lenses it's tough to find subjects with a flat field which need to be shot wide open.
I think, it's literally impossible to get a 14 mm lens with that aperture at the same time doing extraordinary things with test charts at test chart distance and doing well wide open at infinity. Like you said, night sky is one of the fields for it - and unfortunately, if you check it's corners, sharpness is there, but coma as well (butterflies instead of pin points).
All I was saying is that for these kind of lenses it's tough to find subjects with a flat field which need to be shot wide open.