Compare Sigma 28-300mm f/3.5-6.3 Macro for Pentax AF to Pentax smc DA 55-300mm f/4-5.8 ED Lens

Sigma Corporation is pleased to announce the availability of the new 28-300mm F3.5-6.3 MACRO lens. Ultra compact dimensions, length: 3.3", diameter: 2.9", Filter Size: 62mm and a 10.7:1 zoom ratio make this lens the ultimate traveling companion. This versatile, all-purpose zoom can capture a wide ranging series of subjects using its wide angle, ultra-telephoto and close-up capabilities. It incorporates 2pcs Special Low Dispersion SLD glass elements and 4pcs Aspherical Lenses, to produce a high level of optical performance. Aspherical lenses provide excellent correction for all types of aberration while making a very compact construction possible. This lens has a minimum focusing distance of 50cm at all focal lengths. Equipped with a macro mechanism for close-up photography at 300mm telephoto, with a reproduction ratio of 1:3. It is equipped with a "zoom lock" to prevent the zoom setting from being changed inadvertently. It incorporates an internal focusing system, which eliminates front lens rotation, allowin Less

The versatile DA 55-300mm ED zoom lens offers an extreme telephoto zoom range, perfect for those moderate to long shots. ED elements compensate for chromatic aberration, while the PENTAX SP coating protects the exposed lens elements. Developed specifically for PENTAX digital SLRs, the DA 55-300mm ED zoom has a focal length equivalent to 82.5mm to 450mm in the 35mm format. Less