Mount Type:Micro Four Thirds mountF stop range:1.4 - 16Maximum Reproduction Ratio:Approx. 0.11x / 0.22x (35mm camera equivalent)Construction:9 elements in 7 groups (1 Ultra High Refractive Index lens 2 Aspherical lenses)Focal Length:f = 25mm (35mm camera equivalent 50mm)Closest Focusing Distance:0.30m / 0.98 feetFilter Size:46mmDimensions Diameter x Length):(Approx.) 2.7 x 2.1 in. / 63 x 54.5 mm (from the tip of the lens to the base side of the lens mount)Weight:(Approx.) 7.05 oz / 200g LEICA DG SUMMILUX 25mm / F1.4 ASPH. (H-X025) The new LEICA DG lens features the Nano Surface Coating which minimizes ghosting and flare and an Ultra High Refractive (UHR) index lens which makes it thin and light without compromising its image quality. Moreover its F1.4 brightness allows a beautiful soft focus for photos to be even more impressive.