Pictured: Unique-in-the-world (factory custom job) Iscorama with aspherical elements from a Leica Sumicron. More: anamorphic treasure on Flickr Buy: 72mm Tokina +0.4 Diopter on eBay from a London based cinematographer Diopters or achromats dramatically improve the sharpness and minimum focus distance of anamorphic lenses. A Tokina double element diopter has transformed my Isco Centavision anamorphic to the point where it rivals the Iscorama 36 for sharpness. It has halved the…