Effective F-stop reduction when mounted is 1 stop.
Lens configuration: 4 groups, 5 elements
Maximum diameter x length: φ72.8 x 27.2mm
Weight: 220g
Accessories: Case
Compatible lenses: Prime lenses with a focal length of 135mm or longer, and EF70-200mm F2.8L IS II USM, EF70-200mm F2.8L IS USM, EF70-200mm F2.8L USM, EF70-200mm F4L IS USM, EF70-200mm F4L USM, EF100-400mm F4.5-5.6L IS USM
*When using Extender EF1.4x II, AF speed will be approximately halved.
