Yongnuo Extender YN-2.0XIII 2X Magnification Teleconverter Auto Focus Mount Lens for Canon EOS EF Lens

About the product 1---Lens mount index(on lens) 2---Lens mount index(on camera) 3---Lens release lever 4---Contacts 5---Rubber ring Please read the instruction manual carefully before using the product. Please keep the instruction manual properly for future reference. Please use the product properly on the basis of fully understanding the content. Safety Precautions 1.Do not stare at the sun or a bright light source through the lens with the Extender attached,or with a camera with the Extender and lens attached.Doing so could result in visual impairment.In particular,do not look at the sun directly through the lens with the Extender attached,otherwise it could result in loss of vision. 2.Do not leave the lens with the Extender attached,or a camera with the Extender and lens attached in the sun without the lens cap on.Otherwise it may result in concentrating the suna??s rays ,causing a fire. 3.Do not leave the Extender in excessive heat places, such as in a car with direct sunlight.High temperatures can cause the Extender to malfunction. Usable lenses Lens /Focal Length and Maximum Aperture EF 135mm f/2L USM ,270mm f/4 EF 200mm f/2.8L USM ,400mm f/5.6 EF 200mm f/2.8L II USM ,400mm f/5.6 EF 200mm f/1.8L USM ,400mm f/3.6 EF 200mm f/2L IS USM ,400mm f/4 EF 300mm f/4L USM ,600mm f/8 EF 300mm f/4L IS USM ,600mm f/8 EF 300mm f/2.8L USM ,600mm f/5.6 EF 300mm f/2.8L IS USM ,600mm f/5.6 EF 400mm f/5.6L USM ,800mm f/11 EF 400mm f/4L DO IS USM ,800mm 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 USM ,800mm f/5.6 EF 500mm f/4.5L USM ,1000mm f/9.5 EF 500mm f/4L IS USM ,1000mm f/8 EF 600mm f/4L USM ,1200mm f/8 EF 600mm f/4L IS USM ,1200mm f/8 EF 800mm f/5.6L IS USM ,1600mm f/11 EF 100-400mm f/4.5-5.6L IS USM ,200-800mm f/9.5-11 EF 70-200mm f/4L USM F ,140-400mm f/8 EF 70-200mm f/4L IS USM ,140-400mm f/8 EF 70-200mm f/2.8L USM ,140-400mm f/5.6 EF 70-200mm f/2.8L IS USM ,140-400mm f/5.6 EF 70-200mm f/2.8L IS II USM ,140-400mm f/5.6 EF 300mm f/2.8L IS II USM ,600mm f/5.6 EF 400mm f/2.8L IS II USM ,800mm f/5.6 EF 500mm f/4L IS II USM ,1000mm f/8 EF 600mm f/4L IS II USM ,1200mm 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. Others -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. -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. -Caution 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.