The sigma 60mm f28 dn lens is a high performance mid range telephoto prime with large f28 aperture for use with micro four thirds compact system cameras sigmas new range of dn lenses fall into sigmas art line of lenses and deliver the finest in materials usability and functionality weighing only 190g and being 55mm in length this travel friendly lens offers an angle of view of equivalent to 120mm on the micro four thirds system the sld special low dispersion glass reduces aberratio