Perhaps. However, I found in some subsequent tests that the focal point discrepancy is negligible in real world. Apparently the focus point increments are very small. Comparing 12, 18 and 24 mm wide open f4 shots for sharpness shows no significant difference. I think the DOF is so great at these lengths that the absolute focal points don't correspond so tightly as they do with longer lenses. Dont know why, but that seems to be the case. On Mar 19, 2008, at 9:16 PM, J. C. O'Connell wrote: > what that means is you dont have a true zoom lens most likely, > something must be changing that shouldnt. > jco > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Paul > Stenquist > Sent: Wednesday, March 19, 2008 9:11 PM > To: Pentax-Discuss Mail List > Subject: K20D and DA 12-24 autofocus > > > Tested this combo tonight. The lens locks in autofocus rapidly at > 12mm, even in a dark room. I used the center spot only. > On the other hand, I was unable to nail a focal point correction for > the lens. It backfocuses a little bit at 24mm and front focuses a bit > at 12mm. So I leaned the adjustment toward the 24mm value, since the > DOF is so great at 12 mm. I think I ended up at +3. Should be fine, > but I was hoping for consistency there. > Paul > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above > and follow the directions.
-- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
