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.
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