Bulent, You are right, that's the case for the normal operation. However, for the lenses witout SDM, modern bodies are using the screw driver. So, in principle, if the SDM is disabled in the lens, the camera may be fooled to think that the lens never had an SDM, and would use the screw-driven AF.
Igor Wed Feb 12 13:09:33 EST 2014 Bulent Celasun wrote: All the never bodies use "only" the SDM. The screw driven mechanism is made unavailable via the firmware of the body. I believe you can use the screw mechanism on K10D with an earlier firmware. All the later bodies use only the SDM. Period. Bulent --------------------------------------------------------------------- http://patoloji.gen.tr http://celasun.wordpress.com/ http://www.flickr.com/photos/bc_the_path/ http://photo.net/photodb/user?user_id=2226822 http://www.pentaxphotogallery.com/artists/bulentcelasun 2014-02-12 19:56 GMT+02:00 Igor Roshchin <str at komkon.org>: > > > Hi All, > > I need to figured out which of the two AF mechanisms in the 50-135 > lens are actually working at this time. > > The entire story is that I bought a used 50-135/2.8 from KEH, > and when it arrived, the AF was dead. > I sent it back for a warranty [KEH] repair, and it came back rather > quickly. Now, I have a feel that the focus is going slower compared > to what I remember. > > So, my suspicion is that in their "repair" they just > disabled the SDM instead of replacing. But I am not 100% certain, - > especially since I've never seen how fast or slow the screw-driver > focus on this lens was. > > Any ideas? > > Igor > > -- 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.
