Hi Igor:  I would just like to add that my DA* 50-135 failed after 6 years of 
service. I purchased it in 2007.  Worked beautifully the whole time, then it 
got tired, I suppose :-).
Cheers, Christine


On Dec 18, 2013, at 9:55 AM, Igor Roshchin <[email protected]> wrote:

> 
> Thanks a lot to all who responded (wow, there were many responses, - 
> and many people who dealt with the failed SDM!). 
> I didn't have a chance to clean the contacts and re-check the mount yet.
> I'll report back when I have updates on the issue.
> 
> Igor
> 
> 
>> Date: Mon, 16 Dec 2013 18:57:04 -0500 (EST)
>> From: Igor Roshchin 
>> 
>> 
>> 
>> I have a question for those people who had SDM (or in general, lens
>> chip) failed and replaced.
>> 
>> I see that with one of the SDM lenses my K5 has the aperture and speed
>> settings rapidly (as in crazily) fluctuating. (And the focus shows "MF",
>> regardless of the focus selector position.)
>> I was wondering if this is one of the symptoms of the failed chip or
>> that could be for a different reason.
>> 
>> When I had a previous chip failure, I didn't see anything like this.
>> When the chip failed in your lens, did you see this type of a
>> fluctuation?
>> I wonder if could be something else that happened to the lens.
>> 
>> Igor
>> 
> 
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