The Canon EF 50mm f/2.5 Macro Lens is Canon's shortest (in both focal length and physical length) macro lens. Although designated and classified as a macro lens, the 50 macro natively offers only 1:2 (.5x) magnification (vs. 1:1 (1x) in most true macro lenses).

Canon EF 50mm f/2.5 macro - Review / Test Report Lens Reviews - Canon EOS (APS-C). The Canon EF 50mm f/2.5 macro was introduced back in December 1987 so it's one of the oldest lenses in the line-up and it seems as if Canon has discontinued the lens with the recent introduction of the new EF-S 60mm f/2.8 USM (w/reduced image circle).

Canon's sharpest 50mm lens, this 50mm Compact-Macro works great for everything for which you'd use a 50mm fixed normal lens, and it focuses super-close for macro shots with no fiddling required.