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.
Lens Mount: PENTAX KAF2 MountLens Construction: 15 elements in 12 groupsAngle of View: 83 - 31.5 degrees (when used with PENTAX Digital SLR camera body)Aperture Control: AutomaticMinimum Aperture: F22Number of Diaphragm Blades: 9Metering System: TTL open-aperture meteringMinimum Focusing Distance: 0.3mFilter Size: 77mmMaximum Magnification: 0.21XDimensions (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