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05-04-2014, 07:18 PM   #1
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Beginning signs of SDM failure in 50-135???

Last fall I had my 50 mm lens quit focusing on me. While it was in for repair, I started relying more and more on my 50 - 135 and fell in love with the lens again. used it for all of my Fall High School Senior photo sessions and it really Wowed me! So the other day I had it out and noticed it took a bit of a "warming up period" before it would focus at all. After trying for a minute or two it would finally catch focus and once again took amazingly sharp photos. I'm wondering if this is the beginning signs of the SDM failing? And if so, should I send it to repair now? or do you have to wait until it totally dies to send it in?

05-04-2014, 07:30 PM   #2
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The 50-135 seems to be less prone to total failure than the 16-50 (I have both). While some people have had their 50-135s repaired, others have converted them to screw drive, but a fair number (like me) find that they remain in the "slow-wake-up" state if left for a while.
05-04-2014, 07:59 PM   #3
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I have read that ensuring you always store the lens upright helps with this problem. I used to get it occasionally, but a year or so down the track the lens is still going strong.

Certainly convert it to screw drive if the SDM fails though: it is too fine a lens to do without.
05-04-2014, 08:05 PM   #4
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QuoteOriginally posted by Sandy Hancock Quote
I have read that ensuring you always store the lens upright helps with this problem. I used to get it occasionally, but a year or so down the track the lens is still going strong.


Certainly convert it to screw drive if the SDM fails though: it is too fine a lens to do without.
What do mean by convert it to screw drive?

05-04-2014, 08:12 PM   #5
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