Olympus Zuiko Digital 35mm f/2.0 14-ED Lens for Olympus - Zoom, for Digital SLR, Max Aperture: f / 2, trans-standard zoom not stabilized near telecentric, Specific mount digital cameras 4 / 3, 35 mm equivalent focal length : 28 - 70 mm Lens Construction: 18 elements in 17 groups including 2 ED lenses, Aspherical ED 1, an aspherical 2 years