Sigma 50mm f28 EX DG Macro Lens Pentax AF

This 50mm f2.8 EX DG lens has been optimised for use with Digital SLR cameras.The MACRO 50mm F2.8 EX DG incorporates the very latest optical technology and is an ideal standard lens for digital SLR cameras. This advanced lens design corrects various aberrations and is specially coated to get the best colour balance, whilst cutting down ghost caused by reflections from the digital image sensor. It provides the utmost correction against lateral chromatic aberration which is a serious problem for digital SLR cameras. The 50mm F2.8 EX DG incorporates a Floating Internal Focusing FIF system which enables this lens to photograph objects precisely not only at life size reproduction but also at infinity. The lens has a minimum focusing distance of 18.9cm and is capable of true macro photography with a maximum magnification of 11. This lens is equipped with a Focus Limiter Switch that limits the auto focus range, allowing the camera focus more quickly. This lens has a minimum aperture of F45 for Sigma, Canon and Konica Minolta mounts which produces a tremendous depth of field. A screw in hood is included, for convenient use of circular polarizing filters. It is also possible to attach a 72mm filter in front of the lens hood.SpecificationsFocal Length 50mmMinimum Aperture F45 for Sigma, Canon and Konica Minolta mounts or F32 for Nikon and Pentax mountsLens Construction 10 Elements in 9 GroupsFocusing System Floating Internal FocusingAngle of View 46.8°Number of Diaphragm Blades 7pcsMinimum Focusing Distance 18.9cmMaximum Magnification 11Filter Size diameter 55mmLens Hood Screw in type hoodDimensions Diameter 71.4mm x Length 64.0mmWeight 315g