The Sigma 56mm f/1.4 DC DN is part of Sigma's Contemporary series of lenses, and is designed for use with APS-C-format Micro Four Thirds mount mirrorless cameras. The lens is characterized by its bright f/1.4 maximum aperture, which suits working in difficult lighting conditions and also offers improved control over depth of field for isolating subjects and working with selective focus techniques. The optical design utilizes two aspherical elements and one SLD element, which help to reduce both spherical and chromatic aberrations for greater sharpness and clarity. Specifications Focal Length: 56mm (35mm Equivalent Focal Length: 84mm) Maximum Aperture: f/1.4 Minimum Aperture: f/16 Lens Mount: M43 Format Compatibility: APS-C Angle of View: 28.5° Minimum Focus Distance: 1.64' / 50 cm Maximum Magnification: 0.14x Optical Design: 10 Elements in 6 Groups Diaphragm Blades: 9 Rounded Focus Type: Autofocus Filter Size: 55mm (Front) Dimensions: 2.62 x 2.34" Weight: 9.88 oz Includes Sigma 56mm f/1.4 DC DN Contemporary Lens for Micro Four Thirds Sigma LCF-55 III 55mm Lens Cap Sigma LCR II Rear Cap Sigma LH582-01 Lens Hood Sigma 1-Year Warranty Sigma 3-Year U.S.A. Warranty Extension SanDisk Extreme 64GB SDXC Class 10 Memory Card Opteka 55mm Filter Kit (UV, CPL, ND) Opteka Heavy Duty Wrist Strap Opteka Memory Card Reader Opteka Memory Case Opteka Mini Tripod Opteka Lens Cap Keeper Circuit City Lens Pen Circuit City Dust Brush Circuit City Air Blower Circuit City Empty Bottle Circuit City 3"x5" Lens Tissues (50) Circuit City Standard Microfiber Cloths (2) Circuit City Large Microfiber Cloth.