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12-01-2009, 01:18 PM   #1
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SDM With DA 17-70

With most of the complaints about SDM failures having to do with the DA* 16-50 and 50-135 lenses, it's easy to forget that the the Pentax DA 17-70 lens also has an SDM motor.

Perhaps I've missed something but I haven't heard much about SDM failures with this lens. I wonder if the set-up for the 17-70 might be different enough make the SDM technology more reliable than it is in the DA* line. Perhaps there simply aren't enough DA 17-70 lenses out there to account for many of the failure complaints.

As an owner of both the DA* 16-50 and 50-135 lenses, I haven't experienced any problems so far. But, statistically speaking, it seems the chances of me experiencing an SDM failure over the next couple of years is a bit high. I wouldn't mind having a reliable back-up zoom in this range that's still better than the kit lens. But if the 17-70 is exactly the same as the DA* line is as far as SDM is concerned... maybe I should pick up a leftover DA 16-45 to go with my DA 55-300.

Anyone have any information or thoughts?

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