Product: YONGNUO YN2.0X III Teleconverter Extender Auto Focus Lens for Canon EOS EF Lens
Brand: YONGNUO
Color: White
Usable Lenses LensFocal Length and Maximum Aperture EF 135mm f/2L USM270mm f/4 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 Using an Extender with this lens may result in incorrect autofocus. If your camera has an AF microadjustment function,do the AFmicroadjustment. If your camera does not have an AF microadjustment function,focusmanually if the AF precision is way off. If the automatic focusing does not smooth,it is because the lens aperture is too small and zoom out two stop of the aperture to decrease half of the into light.At that time please use the automatic focus. Mounting and dismounting the Extender 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. Package Including: 1 x Yongnuo YN2.0X III Teleconverter 1 x Protecting Bag 1 x User Manual in English and Chinese
The Magnification: 2 times
Mount: EF mount(Electronically controlled)
Lens construction: 9 elements in 5 groups
Dimensions(max.dia. ×length): 55×73.9mm
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.

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