Schneider PC-TS 4.5/90 is a Manual Focus (MF) Perspective Control 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 90mm. With the max aperture of only f4.5 at 90mm, it is considered a slow lens.
Schneider PC-TS 4.5/90 is not a weather sealed lens, so you have to be extra careful against rain and dust.