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Pentax SMC DA* Series 16-50mm f/2.8 ED AL IF SDM Wide Angle Zoom Lens for Pentax Digital SLR Cameras The PENTAX DA * 16-50mm F2.8 ED/AL (IF) wide angle zoom lens is designed for exclusive use with PENTAX digital SLR cameras and delivers the highest level of ultimate optical image quality. With aspherical elements, special optical-glass elements and original lens coatings, this lens is superior in terms of contrast, clarity and edge-to-edge sharpness. The 16-50mm features tightly sealed, weather-resistant and dust-resistant construction to enhance durability for use in rain or dusty conditions. It also features the PENTAX-original Quick-Shift Focus System for instant switching to manual-focus operation and PENTAX-original SP (Super Protect) coating to repel dust, water and grease. A new SDM system has been incorporated for smoother, quieter autofocusing operation using a built-in supersonic motor. Pentax SP coating protects the exposed lens elements Two ED elements and 3 aspherical elements compensate for chromatic and spherical aberration Developed specifically for Pentax digital SLR’s Focal length equivalent to 24.5mm to 76.5mm in the 35mm format Accepts 77mm Filter Unit Dimensions (diameter x length) - 3.3 x 3.9 (84mm x 98.5mm); Weight - 19.9 oz. (565g) without hood; 21.2 oz. (600g) with hood
Customer Review: Great lens
A great wide to standard zoom lens. It is fast, sharp, and has an extremely rugged build. It is definitely a large, heavy lens compared to the DA 18-55MM, for example. On the other hand, the weather sealing is evident and the focusing ring is large. The SDM is virtually silent, quick, and silky smooth. Overall this lens is well worth the investment.
Customer Review: Bad quality control
After buying this lens I noticed that most pictures were “soft” on the right side. Not on the left. I then did some more specific testing at all focal lengths and aperture values, and found out that the lens was decentered. This lens has had a very big quality control problem that you can read about all over the net. I thought I might get lucky, but I was wrong. Luckily I bought it from Amazon. They have such a great return policy.

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