My best lens,
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This review is from: Pentax SMC DA* Series 16-50mm f/2.8 ED AL IF SDM Wide Angle Zoom Lens for Pentax Digital SLR Cameras (Electronics)
I love this lens. It focuses so quickly and quietly that the only way you know it happened are the dots in the view finder. The first time I used I thought the lens wasn't focusing but it was just really quick and quiet. Focus is dead on. I already had the firmware upgrade on my K10D so it was dead on right out of the box. The image quality is fantastic even at 16mm. I haven't noticed any distortion on any of my images that you might expected from a super wide lens. This is the lens I should have gotten with my K10D instead of the Tamaron lens set that I got instead. I haven't had the lens that long so I don't know if I will have the QC issues that others have reported. If I do I will update this review.