The YN-2.0X III is the updated version of YN2.0X II.
Suit for Below EF EOS Camera Lens:
EF 135mm f/2L USM270mm f/4Mounting and dismounting the Extender
EF 200mm f/2.8L USM400mm f/5.6
EF 200mm f/2.8L II USM400mm f/5.6
EF 200mm f/1.8L USM 400mm f/3.6
EF 200mm f/2L IS USM400mm f/4
EF 300mm f/4L USM600mm f/8
EF 300mm f/4L IS USM600mm f/8
EF 300mm f/2.8L USM 600mm f/5.6
EF 300mm f/2.8L IS USM600mm f/5.6
EF 400mm f/5.6L USM800mm f/11
EF 400mm f/4L DO IS USM800mm f/8
EF 400mm f/2.8L USM 800mm f/5.6
EF 400mm f/2.8L II USM 800mm f/5.6
EF 400mm f/2.8L IS USM800mm f/5.6
EF 500mm f/4.5L USM 1000mm f/9.5
EF 500mm f/4L IS USM1000mm f/8
EF 600mm f/4L USM 1200mm f/8
EF 600mm f/4L IS USM1200mm f/8
EF 800mm f/5.6L IS USM1600mm f/11
EF 100-400mm f/4.5-5.6L IS USM200-800mm f/9.5-11
EF 70-200mm f/4L USM F140-400mm f/8
EF 70-200mm f/4L IS USM140-400mm f/8
EF 70-200mm f/2.8L USM140-400mm f/5.6
EF 70-200mm f/2.8L IS USM140-400mm f/5.6
EF 70-200mm f/2.8L IS II USM140-400mm f/5.6
EF 300mm f/2.8L IS II USM600mm f/5.6
EF 400mm f/2.8L IS II USM800mm f/5.6
EF 500mm f/4L IS II USM1000mm f/8
EF 600mm f/4L IS II USM1200mm f/8
EF 1200mm f/5.6L USM 2400mm f/11
First attach the Extender to the lens,then attach it to the camera.Please follow the opposite procedures to disassemble.
To detach the Extender from the lens,push the lens release lever as shown by the arrow,then turn the Extender counterclockwise. Maximum Aperture with the Extender
When Extender EF2X is attached,the lens maximum aperture will be smaller by 2 stop.In the above two case, the camera will compensate the exposure automatically.
Do not attach two or more Extenders on the same camera.Doing so will degrade the optical performance and the camera will not be able to obtain proper exposure readings.
In order to maintain the precision of autofocus control,the speed of automatic focusing will slow down when using the Extender.
When the lens taken from cold to warm places, the surface and internal condensation may occur. In order to prevent condensation, when taking the lens from cold to warm places, please first put the lens in sealed plastic bags, then take out after the lens warming up. And use the same method when taking out from the warm to cold places.