Dang, I completely forgot! Cetussoft.com is not available to me. keiht
Fred wrote: > > > What's the sharpest aperature for this lens? any opinions? > > For four samples of the lens design (with almost no variance from > sample to sample, which is a little unusual), for simple straight > high-contrast resolution, it's f/5.6. See > http://www.cetussoft.com/pentax/50's/resolutn.htm . > > Fred
