Title: Bad quality control
Product review: After buying this lens I noticed that most pictures were "soft" on the right side. Not on the left. I then did some more specific testing at all focal lengths and aperture values, and found out that the lens was decentered. This lens has had a very big quality control problem that you can read about all over the net. I thought I might get lucky, but I was wrong. Luckily I bought it from Amazon. They have such a great return policy.As of 1/25/10 quality control problems for this lens have NOT been fixed. SDM failure is quite common. In fact, there is now an online petition to Pentax about this with over 400 signatures. I went through 3 of these lenses (one SDM failure, two with decentering) before I gave up.
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