The Pentax SMCP-DA 55-300mm f/4-5.8 ED Lens offers an extreme telephoto zoom range, and is perfect for those moderate to long telephoto shots. Designed specifically for digital SLR cameras, this lens provides an angle-of-view equivalent to an 82.5-450mm lens in the 35mm format.
The SMCP-DA 55-300mm f/4-5.8 ED's elements have been treated with Pentax's acclaimed Super-Multi-Coating for maximum light transmission, sharp definition, and high contrast, while minimizing flare and ghost imaging. In addition, SP coating is used on the exterior element to protect the lens against water and grease. ED elements compensate for chromatic aberration.
Note:
Not compatible with "full-frame" (35mm size) cameras
DA Series
The image circle in DA-series lenses is designed to perfectly match the 23.5mm x 15.7mm size of the CCD used in Pentax digital SLRs to optimize camera performance. This design also contributes to a drastic reduction in size, weight and production cost, compared to 35mm-format counterparts with similar specifications.
SP Coating
SP (Super Protective) coating made of a special fluoride compound has been applied to the front surface of the lens to offer excellent water- and oil-repellent performance.
ED elements compensate for chromatic aberration.