Authorized Sigma Reseller, 4-Year U.S.A. Warranty The 16mm f/1.4 DC DN is part of Sigma's Contemporary series of lenses and is designed for use with Canon EF-M mount mirrorless cameras. Characterized by its bright f/1.4 maximum aperture, this lens is adept at working in low-light conditions and also affords increased control over depth of field for selective focus control. The optical design makes use of several low dispersion and aspherical elements, which control color fringing and various aberrations in order to provide high sharpness and clarity throughout the aperture range. Individual elements also feature a Super Multi-Layer Coating to suppress flare and ghosting.Specifications Focal Length: 16mm (35mm Equivalent Focal Length: 24mm) Maximum Aperture: f/1.4, Minimum Aperture: f/16 Lens Mount: Canon EF-M Format Compatibility: APS-C Angle of View: 83.2° Minimum Focus Distance: 9.84" / 25 cm Maximum Magnification: 0.1x Optical Design: 16 Elements in 13 Groups Diaphragm Blades: 9 Rounded Focus Type: Autofocus Filter Size: 67mm Dimensions: 2.84 x 3.63" Weight: 14.29 oz / 405 gIncludes Sigma 16mm f/1.4 DC DN Contemporary Lens Sigma LCF-67 III 67mm Lens Cap Sigma Rear Cap LCR II Sigma Petal-Type Lens Hood Sigma 1-Year U.S.A. Warranty Sigma 3-Year U.S.A. Warranty Extension.