Yongnuo Teleconverter Extender YN- EF 1.4 Version 3

Yongnuo's Extender EF 1.4x III Teleconverter is designed for selected Canon EF-mount lenses and allows you to increase the effective focal length of lenses for a longer range. The electronic design of the teleconverter allows compatible lenses and camera bodies to communicate to support autofocus and auto-exposure, and the optical design consists of seven elements in three groups to maintain image quality. The lens must be able to accept a teleconverter.

Compatibility

Canon EF 135mm f/2L USM, EF 180mm f/3.5L Macro USM (AF supported from 2.6' / 80 cm to infinity)

Canon EF 200mm f/2L IS USM

Canon EF 200mm f/2.8L II USM

Canon EF 300mm f/2.8L IS II USM

Canon EF 300mm f/2.8L IS USM

Canon EF 300mm f/4L IS USM

Canon EF 400mm f/2.8L IS II USM

Canon EF 400mm f/2.8L IS USM

Canon EF 400mm f/4 DO IS II USM

Canon EF 400mm f/4 DO IS USM

Canon EF 500mm f/4L IS II USM

Canon EF 500mm f/4L IS USM

Canon EF 600mm f/4L IS II USM

Canon EF 600mm f/4L IS USM

Canon EF 70-200mm f/2.8L IS II USM

Canon EF 70-200mm f/4L IS USM

Canon EF 70-200mm f/4L USM

Canon EF 200-400mm f/4L IS USM Extender 1.4x (without 1.4x extender in use)

The following lenses are only supported when used with a Canon EOS-1D X, 1Ds Mark III, 1Ds Mark II, 1Ds, 1Ds, 1D Mark IV, 1D Mark III, 1D Mark II N, 1D Mark II, 1D, 1V/HS, 5D Mark III or 7D Mark II camera, and the center AF point is only available:

Canon EF 400mm f/5.6L USM, EF 800mm f/5.6L IS USM, EF 100-400mm f/4.5-5.6L IS USM, EF 100-400mm f/4.5-5.6L IS II USM and EF 200-400mm f/4L IS USM Extender 1.4x (with 1.4x extender in use)

The EF 70-200mm f/2.8L USM lens is also compatible, but only center AF is supported.