The 100mm f2.8 is a medium telephoto lens that has been given anamorphic characteristics. It has a killer vintage anamorphic appearance:
This lens is a Russian lens that has been modified by Iron Glass adapters to create a realistic Anamorphic look. The intention was to mimic the flare and bokeh pattern only. There is no squeezing taking place. I recommend using ND filters to keep the aperture nearly wide during bright scenes .