Igor, >the camera may be fooled to think that the lens never had an SDM
I had never been able to do that. I remember the trick was described by someone from Russia... Still, if you have a recent body or an older body with current firmware, only the SDM can be used. If the SDM "on the lens" is not working; it can not autofocus; there is no fall back to the surviving and mechanically fully functional screw driven mechanism. By the way, my lens is still waiting to be repaired (second time); its SDM is at fault again (after a trauma!). 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 20:17 GMT+02:00 Igor Roshchin <[email protected]>: > > 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. -- 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.
