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Pentax shooters who have pre-K10D bodies should consider the Sigma 18-50mm f/2.8. While not as well built, it costs less than half and is optically superior in distortion control, magnifying ability, and vignetting. However, owners of the K10D and K20D -- and Pentax legacy DSLR shooters who plan to upgrade to newer bodies -- may want to invest in this new zoom for its silky new SDM-driven autofocusing and its clearly superior, last-forever build.
Specifications
16-50mm (16.34-47.66mm tested), f/2.8 (f/2.93-2.90 tested), 15 elements in 12 groups. Focusing turns 70 degrees clockwise. Zoom ring turns 90 degrees counterclockwise. Focal lengths marked at 16-, 20-, 28-, 35-, and 50mm.
• Diagonal view angle: 83-31 degrees.
• Weight: 1.33 lb.
• Filter size: 77mm.
• Mounts: Pentax KAF2.
• Included: Lenshood, soft lens case.
• Street price: $900.
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