Maximum Aperture Of F 1.4Shallow Depth Of Field FocusIt'S Created By The Circular Aperture Diaphragm Of This Canon Camera LensStyle:f/1.4 USMProduct DescriptionStandard lens Featuring superb quality and portability. Two high-refraction lens elements and new Gaussian optics eliminate astigmatism and suppress astigmatic difference. Crisp images with little flare are obtained even at the maximum aperture.Set Contains:Canon Normal EF 50mm f/1.4 USM Autofocus Lens, E-58U 58mm Snap-On Lens Cap, Lens Dust Cap E (Rear) and 1-Year Warranty.