Carl Zeiss Makro-Planar T2/50 is a Manual Focus (MF) Macro 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 50mm. Providing a max aperture of f2 at 50mm, this lens is very fast.
Carl Zeiss Makro-Planar T2/50 is not a weather sealed lens, so you have to be extra careful against rain and dust.