To add to what others said, screw drive is noisy. SDM is almost silent. Paul via phone
> On Feb 12, 2014, at 12:56 PM, Igor Roshchin <[email protected]> wrote: > > > > 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.
