Tamron SP 45mm F1.8 Di VC USD (Model F013) Canon: Redefining the standard?

Introduction When Tamron introduced a new 35mm f/1.8 model complete with stabilization, the company also announced a 45mm version. The focal length provides a slightly wider field of view than the traditional 50mm, but with a ring-type sonic AF motor with rear focusing and a floating system, this is a sophisticated optical design — far beyond the typical standard 50mm f/1.8 models. Lens construction consists of10 elements in 8 groups, which include two aspherical lenses to reduce coma and spherical aberrations for increased sharpness and clarity at wider apertures. Although the 45mm omits the XLD (eXtra Low