Sam, For each lens you have to make separate test(s). For 18-55mm and 55-300 mm lenses you can either make the tests for the focal length you use most (say, 28mm for the kit lens and 70mm for the tele); or choose a mid value for each zoom as if they were primes at that focal length. For the 40mm, you just test.
I am not sure whether you can make focus adjustments on Kx, though... If you just want to "see" if there is a problem with your camera's AF hardware, you may need another properly focusing Pentax DSLR around. Try the DA 40mm with both; if your camera does not focus correctly (but the other does), it may need to be fixed. Bulent --------------------------------------------------------------------- http://photo.net/photodb/user?user_id=2226822 http://www.pentaxphotogallery.com/bulentcelasun 2011/4/8 Sam L <[email protected]>: > Hi all, > > I have a K-x that seems to me to always be just a little soft > focusing. I'd like to finally get around to testing it a little > scientifically. To that end I have downloaded the focus charts etc > from > http://regex.info/blog/photo-tech/focus-chart > > I know I'm supposed to test using the smallest possible depth of > field. Here are the lenses I can use: > > Auto Focus: > DA40 > 18-50 Kit > 50-300 Kit > > Is the DA40 adequate for determining the focus accuracy of the AF system? > > I also have these MF lenses, but am not sure how to best test out the > MF focus system (which is a combination of me and the camera). > SuperTak 50/1.4 > SuperTak 85/1.9 > > > Thanks! > > --------------------------- > Sam > > -- > 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.
