From Ammonite, these Expanded Guides are much more than just user guides! Written by experts and with worked examples, they are jargon free, full-color, and inclusive. This title explores the huge range of Sigma lenses for digital SLR cameras and explains how precision engineering helps photographers to maximize their creativity by fulfilling the full potential of the equipment. Information is given on lenses from the standard, macro, and wide angle types, to special lenses from aspherical ASP models that give high optical performance in a compact size, APO types that minimize color aberration, to the OS range that compensates for camera shake.