Focal length and maximum aperture 50 mm f14 lens construction 7 elements in 6 groups diagonal angle of view 46 degrees focus adjustment overall linear extension usm closest focusing distance 045m 15ft filter size 58mm this standard lens features superb quality and portability two high refraction lens elements and new gaussian optics eliminate astigmatism and suppress astigmatic difference if crisp images with little flare are important to you they can b