I have this lens and couldn't be more pleased with both the optical and build quality. I am in the process of trading it in on the new DF model that is identical optically but has been redesigned to incorporate the "dual focus" mechanism. This allows you to disengage the focusing collar so that it does not rotate when auto focusing. The feel on manual focus on the older one is excellent, but now that I have and MZ-S and auto focus, I find it easier to disengage the collar so I do not restrict the lens rotations by holding on to the focusing collar. On other Sigma EX lenses I already own that have this dual focus mechanism, the feel on manual is excellent, as good as my older manual focus lenses. Cheers, Mike. [EMAIL PROTECTED] wr >Fellow pug-sters: > >any opinions on the optical quality of the Sigma 28-70/f2.8 Aspherical? > >fast/normal/slow AF operation w/pz-1p? > >difficult to use as a manual focus lens? > >tia > >be well > >robo >- >This message is from the Pentax-Discuss Mail List. To unsubscribe, >go to http://www.pdml.net and follow the directions. Don't forget to >visit the Pentax Users' Gallery at http://pug.komkon.org . > > >. - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
