The "FUJINON TELECONVERTER XF2X TC WR" is a high-performance teleconverter capable of multiplying the focal length of mounted lenses* by two. It features excellent optical design with a construction of 9 elements in 5 groups to maintain the optical performance of the original lens. Also, thanks to the unified design when mounted to a compatible lens, the teleconverter is weather and dust-resistant and operates at temperatures as low as -10°C. This makes it possible to be used with confidence outdoors when used with the weather and dust-resistant X-T1 and X-Pro2 camera bodies, and the XF50-140mmF2.8 R LM OIS WR and XF100-400mmF4.5-5.6 R LM OIS WR lenses.
*A firmware update is required for the "XF50-140mm F2.8 R LM OIS WR" and "XF100-400mm F4.5-5.6 R LM OIS WR" lenses in order to provide full compatibility. This firmware is planned to be available at the beginning of June 2016. Please note that when updating firmware, make sure to update the latest camera firmware before updating the lens.
Please refer to the following website for information on how to confirm your firmware version and its update methods.
Phase detection AF is still available when using the XF50-140mmF2.8 R LM OIS WR with the 2x teleconverter mounted.
Contrast Detection AF is still available when using the XF100-400mmF4.5-5.6 R LM OIS WR with the 2x teleconverter mounted. Accurate focusing at super-telephoto focal lengths with shallow depth of field is possible thanks to the AF performed by the image sensor thanks to mirrorless cameras' "Live View".
The optical image stabilization performance
The camera's optical image stabilization performance** is unaffected by the addition of the teleconverter.
Weather and dust-resistant and -10°C low-temperature operation
Using the teleconverter with a weather-resistant camera, such as the FUJIFILM X-T1 or X-Pro2 mirrorless digital camera and the FUJINON XF50-140mmF2.8 R LM OIS WR or XF100-400mmF4.5-5.6 R LM OIS WR lens does not affect the weather resistance of the system.