Boris Liberman wrote:
Don, et al, how come 28/3.5 is sharper wide open than at f/8 where it should be (close to or) at its sweet spot?
My k28/3.5 is sharpest one stop closed and f8 is little worse than wide open.
cheers -- alkos at tlen pl http://onephoto.net/portfolio.php3?id_autora=17765

