Larry,
Bipin gave an interesting idea.
I had one experience with KEH repairing SDM.
I had one used SDM lens purchased in early 2014 from KEH, and the SDM AF
failed right away. I sent the lens back to KEH and they repaired it within
a week or two. I don't know what they actually did with it. (Did they
replace the motor, the chip?)
In the past month, I have had 2-3 occasions when the lens wouldn't start
focusing when I mount it on the camera, but then, after I turn the ring
manually (no obstruction, even slightest is felt), - it starts working.
I suspect it's at the verge of failing again.
I have only one other data point for comparison:
The lens where the SDM chip was replaced by CRIS under warranty, hasn't
shown any problem over 3 years since the repair.
In any case, I have too few data points to make any conclusions.
But maybe those are helpful for you.
Igor
Bipin Gupta Mon, 28 Sep 2015 07:18:32 -0700 wrote:
Hello Larry, suggest you try KEH.
I have had some lenses repaired from them, though not SDM related.
Rergards.
Bipin
camp: San Mateo, CA
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