This EF 50mm f/2.5 Compact Macro Lens from Canon is a lightweight and compact 50mm macro lens for general-purpose standard focal length shooting and for close-up 1:2 half life size macro photography. A floating optical system enables sharp delineation at all focusing distances. With a large f/2.5 maximum aperture, the lens is effective in low light and provides shallow depth of field and its truly circular 6-blade diaphragm offers beautiful background blur.