Zeiss Milvus 18mm F2.8 is a Manual Focus (MF) Wideangle Prime lens with 35mm FF max sensor coverage. When mounted on a 35mm FF sensor camera, it will give you an FF equivalent focal range of 18mm. With a max aperture of f2.8, this is a fast lens.
Zeiss Milvus 18mm F2.8 is weather sealed which makes it an ideal lens for outdoor use, especially when coupled with a weather sealed camera body.