Theoretically, you should be right. I randomly chose to test mine at 70 and 100. The result (+2) was the same at both focal lengths. I used the Nikon target which works well. Paul -------------- Original message ---------------------- From: jtainter <[EMAIL PROTECTED]> > Just back from 9 days in Italy, to which I took the K20D, the FA 31, and the > three pups--the DA limiteds. I would have taken instead the DA* zooms, but as > I > reported here, the DA* 16-50 does not focus correctly at 16 mm on the K20D. > It > focuses fine from 18-50 mm, and fine at all focal lengths on the K10D. So the > K20D and the DA* 16-50 need to go to Pentax to be calibrated to each other. > > Before I send them off I would like to test the K20D and DA* 50-135 together > for > any focus adjustment issues. Here is my question: Am I correct in assuming > that > the best focusing test/adjustment of a constant aperture telezoom will be at > the > long end, where the DOF is the most shallow? In other words, if I have to > select > a focal length at which to test the DA* 50-135, I assume that the best focal > length is 135 mm. Is my reasoning correct? > > I actually had only one day in Milan in which to do any photography, but > there > may be some shots worth posting when I get to it. > > Thanks, > > Joe > > > > -- > 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.
