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.
http://www.eoshd.com/anamorphic-guide
Tarantino shot Django Unchained in anamorphic and it looks superb.
