Description ELEGANT series lenses are the result of 7 years continuous work world-first full-frame lenses for new Canon EOS R mount mount cameras from third-party manufacturer. We took 7 years non-stop learning for how to make high quality lenses, KIPON accumulated rich experience now, The reason why we use ELEGANT to name this new lineup is because we want to transfer exactly how we develop these lenses from design to manufacture They are consistent with our inertial thinking and philosophy about developing products in our company. Tec Specification: Focal length 50mm Angle of view V/H/D(FF) 46.8 Angle of view  V/H/D(APSC) 20/27/33 Lenes/ Groups 6/6 Close focus  (m)(EOS R/NIK Z) 0.6 Max image Diameter(mm) 44 Aperture F No. 2.4-16 Focus rotation  (EOS R/NIK Z) 108 Iris rotation 76 No.of iris leaves 6 Length     front to sensor at inf(mm) 83 Max diameter(mm) 58 Front filter thread M49x0.75 Weight       (g)(EOS R/NIK Z) 320