The most expensive of the Pentax lenses in this category 16-50mm did not always deliver everything that it promised. In particular, the f/2.8 aperture is more for bright viewing than it is for top-quality imaging. Similarly, the SDM system is indeed smooth and quiet but the lens was positively sluggish in comparison to other lower priced offerings in this range from Pentax.
Pros
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Nice balance and robust feel
Cons
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Slightly stiff and jerky zoom action
Sample images
Score
Score in detail
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Design 85
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Image Quality 85
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Performance 80
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Value 85
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Features 90