RF-Mount Lens/Full-Frame Format 12 elements in 9 groups Quiet and high speed Nano USM AF System 0.88m Minimum Focusing Distance (at 200mm) Maximum magnification of 0.41x (at 400mm) 5.5-stop Optical Image Stabilizer 9-Blade Diaphragm 67mm filter threads Supports optional RF 1.4x and RF 2x extenders