Title: Bad QC
Product review: I'm very disappointed with this lens. The subject of every picture I took on my K10D with this lens was out of focus when shot on auto. The focal point seemed to be 3m behind my subject. None of my other lens have this problem. My DA* 50~135 consistently hits focus on the target and is ridiculously crisp. I could manually focus on my subject and produce a reasonable image if the aperture was dialed down enough, but the point of this lens is the ultrasonic auto focus. At 50mm f2.8 everything was very soft. The image didn't start to sharpen up until f5.6. When shooting at 16mm nothing was sharp. The entire aperture range was blurry. At any range there was a 5mm purple fringe on any high contrast object. I have heard some people have gotten great copies of this lens. This wasn't one of them. For every great review of this lens I see, there are about 8 people complaining about it. Pentax, this is unacceptable. Think of your reputation!
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