Photodo results indicate the F135/2.8 is sharper than the FA. However, I
suggest you go for the FA because the focus ring of the F is too thin for
comfortable manual focus. Also, the F135/2.8 I had had loose moving glasses
due to lousy (imho) mechanical design. The FA135/2.8 is different
mechanically so will not suffer from this potential problem.
Alan Chan
http://www.pbase.com/wlachan
browsing Bojidar's K-mount site I wonder: Sometimes F and FA lenses have
what looks like identical "optical formulas". Would you say that for
instance the F 135/2.8 [IF] and the FA 135/2.8 [IF] also have identical
optical quality?
