Reviews and Problems with Pentax smc DA* 16-50mm F2.8 ED AL (IF) SDM
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Poor quality control
Rnovo, B&H Photo
15 May 2015
Excerpt: Bought new in Dec. 2008. I just had my 4th incident (2 SDMs) with this lens causing me to spend more than the cost new if I decide to have this last one fixed (I did get 1 deal on 1 SDM incident).
Summary: What you have been reading about this lens are mostly true. SDM failure being the biggest issue. When I was doing my research, I read something like Pentax has addressed the issue (though never officially announced) and you will be fine. Not true!
Summary: No matter where my wife and I go with our cameras this lens is always with us. It is just too versatile to stay at home. A must have for any Pentax owner, especially if you plan on extreme conditions.