Samyang 35mm F1.2 is a Manual Focus (MF) Wideangle Prime lens with APS-C / DX max sensor coverage. When mounted on a APS-C / DX sensor camera, it will give you an FF equivalent focal range of 52.5mm. Providing a max aperture of f1.2 at 35mm, this lens is very fast.
Samyang 35mm F1.2 is not a weather sealed lens, so you have to be extra careful against rain and dust.