Wanted: Pentax 17-70 faulty for spare parts


Link Posted 03/04/2016 - 09:53
I'm looking for a faulty Pentax 17-70. I want to cannibalize components to try to fix mine!


Link Posted 03/04/2016 - 17:49
how common is this lens for failures anyways? I was thinking about snagging a used one for about half the price of new, but now I'm worried I keep hearing about the sdm failures?


Link Posted 03/04/2016 - 20:23
The 17-70 is not prone to SDM failure, that 'honour' goes to the 16-50 and 50-135, but only early copies judging by the significant reduction in SDM failure complaints posted in the various Pentax forums. Like any complex equipment, stuff occasionally happens.

It seems that there might be a connection between SDM failures and lack of use. I exercise all my SDM lenses every couple of weeks regardless of whether they've been used in the intervening period, and done have missed a beat, nor exhibited any of the reported pre-failure symptoms

What is rarely heard is how many SDM lenses don't fail.
Last Edited by JohnX on 03/04/2016 - 20:27


Link Posted 03/04/2016 - 21:16
thank you.
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