Quote:
Originally Posted by rogerg
Thanks 
I just stop it down in focal ratio, so from F/1.4 to F/2.8 on the camera settings. I don't stop down the actual apperture of the lens, I think that would only make the situation worse but haven't tested it to have proof Stopping the focal ratio to F/2.8 has a dramatic effect on the picture quality, the corners go from swan shaped stars to circular stars, and F/2.8 is still quite fast
Zooming in/out will change the distortions evident from your lens but I think it's a case of trial and error. I've tried different zooms with my 17-40 and 70-200 and find it's not necessarily the long end (40mm and 200mm) that has less distortions, but there's always a best place, if keen to minimie the distortions.
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Thanks for the info Roger. I'll try it out next time.
