The lens construction of the SIGMA 100-400mm F5-6.3 DG DN OS Contemporary comprises 16 groups and 22 elements, with one FLD and four SLDs used for the effective correction of aberrations and distortions. Built on the latest optical design technology and optimized for mirrorless systems, the new lens ensures the same high-resolution image quality all the way to the edges. In addition, it constantly achieves high levels of optical performance and makes the most of its capabilities as a zoom lens in any condition, at every focal length from wide to telephoto, and from close-up shots to telephoto photography.Specifications Maximum Aperture: f/5 -6.3 Minimum Aperture: f/22-29 Format Compatibility: Full-Frame Angle of View: 24.4° to 6.2° Minimum Focus Distance: 63 in. Maximum Magnification: 1:4.1 (at 400mm) Optical Design: 22 Elements in 16 Groups Diaphragm Blades: 9 Rounded Focus Type: Autofocus Image Stabilization: Yes Filter Size: 67mm Dimensions: 3.4 x 7.8 in. Weight: 2.55 lbsIncludes Sigma 100-400mm f/5-6.3 DG DN OS Contemporary Lens Sigma LCF-67 III 67mm Lens Cap Sigma LCR II Rear Lens Cap Sigma LH770-05 Lens Hood Sigma PT-31 Protective Cover Sigma 1-Year North and South America Warranty Sigma 3-Year U.S.A. Extended Warranty SanDisk Extreme 64GB SDXC Class 10 Memory Card (2) HD 67mm Filter Kit (UV, CPL, ND) Opteka Heavy Duty Wrist Strap Opteka Memory Card Reader Circuit City IR Remote Circuit City Memory Case Circuit City Mini Tripod Circuit City Lens Cap Keeper Circuit City Lens Pen Circuit City Dust Brush Circuit City Air Blower Circuit City 3"x5" Lens Tissues (50) Circuit City Empty Bottle Circuit City Standard Microfiber Cloths (2) Circuit City Large Microfiber Cloth.