12-18-2011, 10:25 PM
[quote name='Klaus' timestamp='1324246902' post='13881']
This is a combination of vignetting (cat's eye) and astigmatism (uneven tangentially and sagittally resolution).
A common problem of extreme aperture lenses actually.
[/quote]
thanks
This is a combination of vignetting (cat's eye) and astigmatism (uneven tangentially and sagittally resolution).
A common problem of extreme aperture lenses actually.
[/quote]
thanks