The Sigma 100-400mm 5-6.3 DG HSM OS Contemporary is a state-of-the-art telephoto zoom that brings a new level of portability and quality to the super telephoto market. Touting Sigma?s Optical Stabilizer (OS), the Sigma 100-400mm 5-6.3 Contemporary is highly compact and lightweight compared to similar products on the market. A push/pull zooming function and a new Hyper Sonic Motor (HSM) allow for a more responsive approach to photography while a 1:3.8 macro feature can be utilized from up close or from a further distance. Like each and every Global Vision Lens, the Sigma 100-400mm Contemporary is handcrafted at our single factory in Aizu, Japan and undergoes individual evaluation before leaving Sigma?s facility. SPECIFICATIONS Lens Construction 21 Elements in 15 Groups Angle of View (35mm) 24.4-6.2 Number of Diaphragm Blades 9 Minimum Aperture f22 Minimum Focusing Distance 160 cm / 63 in Filter Size (mm) 67mm Maximum Magnifications 1:3.8 Dimensions(Diameter x Length) 86.4 - 182.3mm/ 3.4 7.2in Weight 1160g/ 40.9oz.