Sigma Corporation is proud to announce the availability of the latest generation of compact standard zoom lenses, the 28-105mm f3.8-5.6 UC III. This lens builds upon its predecessors (models UC and UC II), offering the same focal length range (28mm to 105mm), and focusing range (19.7 inches to infinity, at all zoom settings) and providing a slightly larger effective aperture (f/3.8-5.6), while reducing the weight to less than 10 oz. A lens design, including the use of aspherical optics and mechanical construction, are credited with the reduction in weight, while maintaining the high level of performance for which these lenses are known. This model retains the internal focusing system and a non-rotating front barrel for convenient filter use.
Lens Construction:13 Elements in 12 GroupsAngle of View: 75.4 - 23.3 degrees Number of Diaphragm Blades: 7 Blades Minimum Aperture: F22 Minimum Focusing Distance: 50cm / 19.7 in. Maximum Magnification: 1:5.6 Filter Size Diameter: 62mm Dimensions: Diameter 71mm x Length 72.5mm / 2.8 in. x 2.9 in. Weight: 275g / 9.7 oz.