I'm pretty sure they are moving to the DC motors that their newer lenses seem to use. Also, they claim to have finally fixed SDM permanently, so sending the lens in should finally be a good fix. I never minded the screw drive, but it does make a lot of noise.
On Tue, Aug 20, 2013 at 8:03 PM, P.J. Alling <[email protected]> wrote: > Pentax getting away from SDM seems unlikely. It's their premium focusing > system, and the newer motors, (lord only knows if the second replacement SDM > motor that failed in this case had been on the shelf), seem to be a bit more > reliable. Every manufacture is moving to a solid state electronic only > interface between their lenses and camera bodies. I personally don't think > this is a particularly good idea, nor do I think it's likely to be the most > cost effective for long term users, but like front wheel drive in cars there > are certain efficiencies in manufacture, even if it complicates repair, and > conventional wisdom believes it's better, so that's what will happen. > > > On 8/22/2013 9:06 AM, Zos Xavius wrote: >> >> Does the tokina variations of these lenses have SDM like the 50-135? >> If it were me I would just use the screw drive. SDM sucks anyways. I'd >> be thankful pentax put in a screw drive for backwards compatibility, I >> imagine they will get away from SDM entirely with new lenses. >> >> On Thu, Aug 22, 2013 at 7:42 AM, SV Hovland <[email protected]> wrote: >>> >>> I have tested this on my own K-7 and DA*16-50. I wanted to find out if >>> this is a good solution for me and I did the test before the warranty went >>> out. I found it to be perfectly good. It focuses just as fast as SDM, but >>> with more noise of course. So I decided to not send my lens in and complain >>> about slow SDM after all. I could wait to complete break down and continue >>> with the "old" focusing instead. >>> >>> Regards >>> Stig Vidar Hovland >>> >>> ________________________________________ >>> Fra: PDML [[email protected]] på vegne av Boris Liberman >>> [[email protected]] >>> Sendt: 22. august 2013 09:09 >>> Til: Pentax-Discuss Mail List >>> Emne: Re: Giving up on Pentax (probably) >>> >>> Well, it was easier than I thought. >>> >>> Here is the link: >>> >>> >>> http://www.pentaxforums.com/forums/pentax-slr-lens-discussion/208353-how-deactivate-sdm-silent-autofocus-allow-screw-drive-autofocus-da-16-50mm-f-2-8-a.html >>> >>> >>> On Thu, Aug 22, 2013 at 9:49 AM, Chris Mitchell >>> <[email protected]> wrote: >>>> >>>> Hi all >>>> >>>> The last straw has been that my DA* 16-50 has stopped auto-focussing >>>> again. The internal motor was replaced a couple of years ago (so out >>>> of warranty) and now it looks like there's another couple of hundred >>>> quid to be spent on it. And yes, I've cleaned all of the contacts and >>>> yes, my DA* 50-135 works OK on my only remaining K-7 body. >>>> >>>> So the decision's nearly made to sell off the K-7, DA* 16-50 (either >>>> repaired or as is), DA* 50-135, a lovely F*300 4.5 (the one with the >>>> tripod mount), an FA-135 2.8 (probably my favourite lens ever) and an >>>> FA-50 1.7. I'll put the proceeds towards a backup Fuji X body and get >>>> the excellent 55 - 200 zoom to cover the long end of the range and to >>>> sit alongside my growing collection of Fuji X primes. I'll keep a >>>> number of MF lenses so may still be able to appear in the PDML >>>> annual... >>>> >>>> Any guidance on how to price? Or if anyone's interested in making me >>>> any sensible offers, contact me off list and I'll get more details and >>>> photos arranged and we can sort out logistics. >>>> >>>> Yours sadly, Chris >>>> >>>> -- >>>> 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. >>> >>> >>> >>> -- >>> Boris >>> >>> -- >>> 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. > > > > -- > A newspaper is a device for making the ignorant more ignorant, and the > crazy, crazier. > > - H.L.Mencken > > > > -- > 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.
