- 50-135mm telephoto zoom lens with F/2.8 maximum aperture for Pentax digital SLR cameras
- Aspherical elements special optical-glass elements and original glass coatings
- Tightly sealed weather- and dust-resistant housing stands up to rainy or dusty conditions
- SDM system produces smooth quiet autofocusing; SP coating protects exposed lens elements
- Measures 3 inches in diameter and 5.4 inches long; weighs 24.2 ounces without hood
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