The GF 1.4X TC WR is a 1.4x teleconverter for the GFX series cameras. Attaching the teleconverter to the GF250mF4 R LM OIS WR enables telephoto shooting up to a focal length of 350mm (approx. 277mm in 35mm format) while maintaining excellent image quality. When connected, the maximum aperture is reduced by one stop. It is dustproof, moistureproof, and weatherproof, and can be used in temperatures down to -10°C.