CA is not usually correctable by stopping down. You're probably experiencing some other kind of problem if simple stopping down totally "fixes" it... jco
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brendan MacRae Sent: Friday, April 13, 2007 10:43 PM To: pdml Subject: Full frame lenses and the K10D, CA anyone? What's the deal with film camera lenses and chromatic aberration on the K10D? Shooting wide open is a nightmare for me. Is anyone else seeing this issue? Is it endemic with film lenses plus the smaller sensors? It can't stricly be a function of older glass since I have seen ED IF lenses having the same trouble on the K10D. Perhaps only the newest of the newest coatings are fixing this issue? I tested the FA31 Ltd, the A*85 f1.4, the A50 1.4, and the FA 24-90 today, all wide open, RAW, ISO 100, and all of them were showing some amount of color fringing. It didn't go away until 2-3 stops beyond wide open on any of these lenses. I'm wasting time trying to fix the problem every time I shoot for shallow DOF. Would a full frame sensor make any difference in this regard? How do the DA lenses handle this? Are they free of CA wide open? One hopes as I have my eye on the DA10-17mm and the DA*50-135mm. -Brendan __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- PDML Pentax-Discuss Mail List [EMAIL PROTECTED] http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [EMAIL PROTECTED] http://pdml.net/mailman/listinfo/pdml_pdml.net
