The Leitz Super-Angulon 4,0/21mm, introduced in 1958, is based on an optical computation by Schneider-Kreuznach.
The symmetrical construction of the lens promised a very good imaging performance for the time, and even today, a well-preserved lens provides high image quality.
Officially listed from 1958 to 1963, either with screw mount or M mount, it appears that the Super-Angulon was manufactured however only in the years 1958 and 1959 and afterwards sold from stock.
A comprehensible step, because it was a lens with a high purchase price and a very small application field.
The Super-Angulon 21mm was mainly used in advertising, architectural and technical phototography, and also promoted for this use by Leica.
Total production: approx. 5.292 units with Leica M mount
Rarity forecast: R6