Hologon
Hologon , also commercially available as Zeiss Hologon ; is the name and a trademark of the Carl Zeiss company (Oberkochen) for a certain type of photographic lens . The name comes from the Greek Horosc (ὅλος, "everything", "perfect") and Gonia (γωνία, "angle").
The super wide angle lens was developed under Erhard Glatzel . It consists of only three lenses of which the outer two, each hemispherical concave meniscus lenses with extremely strong curvature, the middle, biconvex incised lens.
It has no iris diaphragm , the diaphragm is designed for f8, the focus is independent of the distance measurement.
It was or is used u. a. in Contarex and the Leica M . The Leica company presented it at the Photokina 1972 and offered it until 1978. Today it is a sought-after collector's item .
literature
- Gianni Rogliatti : Lenses for Leica and Leicaflex cameras . 1985 ISBN 3-88984-010-8