The "FUJINON TELECONVERTER XF 1.4X TC WR" is a high-performance teleconverter capable of multiplying the focal length of mounted lenses* by 1.4x. Although the aperture becomes one f-stop higher when mounted, the teleconverter features an excellent optical design with a construction of 7 elements in 3 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 FUJIFILM X-T1 or X-Pro2 camera bodies and XF50-140mmF2.8 R LM OIS WR or XF100-400mmF4.5-5.6 R LM OIS WR lenses.