Fujifilm GF 250mm F4 R LM OIS WR is an Auto Focus (AF) Telephoto Prime lens with Medium Forma max sensor coverage. When mounted on a Medium Forma sensor camera, it will give you an FF equivalent focal range of 0mm. With a max aperture of f4 at 250mm, this is a moderately fast lens.
Fujifilm GF 250mm F4 R LM OIS WR is weather sealed which makes it an ideal lens for outdoor use, especially when coupled with a weather sealed camera body.