Sigma 60mm F2.8 DN Art Black Lens for Sony E-Mount NEX (350965) Includes 3 Piece Filter Set (UV-CPL-FLD) + Deluxe Cleaning Kit + Air Dust Blower + Cap Keeper Prints Maximum aperture of f/2.8 is effective in low light and provides shallow depth of field. Part of Sigma's new "Art" class of fast aperture, sharp prime lenses. Linear auto focus motor provides smooth, quiet and accurate autofocus. Special Low Dispersion glass and aspherical elements minimize aberrations to provide sharp imaging throughout the frame. 47th Street Photo is an Authorized Sigma USA Dealer. This item is covered by 4 Year Sigma USA Warranty.