Zen was the Isco CentaVision 2x anamorphic, which is basically a 2x stretch version of the normal Iscorama. The 2x anamorphic gives you the most dramatic anamorphic look but a very wide aspect ratio from a 16:9 camera. The prime lens was cheap $20 Helios 44-M 58mm F2.0, mostly stopped down to F5.6 for extra sharpness.
Plenty more info in my book if you want to get started on the anamorphic stuff.
Tarantino shot Django Unchained in anamorphic and it looks superb.