Hi, The Don gave me the two above mentioned lenses to test drive over the weekend. I'm presuming these are USM lenses. Right now, they seem to be using the body motor for focusing. Do I need to upgrade the firmware to utilize the lens's focusing motor? Thanks
William Robb ----- Bill, I would not update your firmware just to try SDM. If it is any faster than the shaft drive, you will need precise instruments to measure the difference. If you are shooting wildlife the quiet is nice, but otherwise I can see no advantage to SDM. I think it is mostly a marketing gimmick, like some other things Pentax has done because the competition has done them. You can try the 50-135 just fine with the shaft drive. If focuses rather slowly by either method. If you buy one of the DA* lenses, you can consider whether to update the firmware for SDM. I would like Pentax to bring out a firmware update that allows one to switch between shaft drive and SDM. Joe -- 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.
