On Wed, 15 Oct 2003, Steve Desjardins wrote: > What's the sharpest aperature for this lens? any opinions?
http://phred.org/pentax/lensgal/m40_28/m40_28.html has tests from this lens if you want to judge for yourself. It looks pretty soft at f2.8, better at f4, and pretty good at f5.6 and f8. The Lens Gallery is a useful resource for comparing lenses. I don't think it is maintained anymore (if it is then it got moved and no one told me), but my old mirror of it is at http://phred.org/pentax/lensgal/ alex
