SDM failures........
I've never had that issue with my SDM's.
Regards
AF - Pentax K5, Sigma 10-20/4-5.6, Tamron 17-50/2.8, Sigma 30/1.4, Sigma 70-200/2.8, Tamron 70-300/4-5.6
MF - Vivitar CF 28/2.8, Tamron AD2 90/2.5, MTO 1000/11
Stuff - Metz 58 AF1, Cactus v4, Nikon SB24, Raynox 150, Sigma 1.4x TC, Sigma 2x TC, Kenko 2x macro TC, Redsnapper 283 tripod, iMac 27”, Macbook Pro 17”, iPad, iPhone 3G
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1568 posts
15 years
Rainhill
"Just had a talk with Pentax Europe's former technical service manager,
now 645D service (they will keep that in house) and I learned the
following:
- SDM failure rates are monitored and do not exceed those of other components,
- Pentax is aware of the buzz about the issue but considers it unjustified,
- not every perceived failure necessarily is one. SDM motors hold a
charge which depletes after prolonged (months) non-use. Once
discharged, the lens will no longer focus. The charge takes up to two
minutes to rebuild, i.e. the lens needs to be left alone for that time
while connected to a powered on camera. At times, that may still not
be enough to initially overcome mechanical stiction from the long
sitting period."
Interesting
John
In LBA hiatus.