The XF1.4X TC WR is a high-performance teleconverter that can multiply the focal length of the attached lens by 1.4 times. Its excellent design maintains the optical performance of the original lens and looks identical to that of the compatible lens. The connection increases the aperture value by 1 stop. It is weatherproof and dustproof, and it operates at temperatures as low as -10°C, so you can use it with confidence.