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.