Sigma 30mm F2.8 DN Black Lens for Sony E-Mount NEX (33B965) Includes UV Ultraviolet Filter + Deluxe Cleaning Kit + Air Dust Blower + Cap Keeper Prints Maximum aperture of f/2.8 is effective in low light situations and able to create lovely shallow depth of field images. Two glass mold aspherical lenses, including a double-sided aspherical lens, provide excellent correction for all types of aberration. Inner focusing system and linear autofocus motor for efficient, smooth, quiet and accurate focus. Part of Sigma's new "Art" class of fast aperture, sharp prime lenses. 47th Street Photo is an Authorized Sigma USA Dealer. This item is covered by 4 Year Sigma USA Warranty