Leitz SummiKron 5 cm f/2 Prototype "A"
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Description
Im Jahr 1950 sollte dem Summitar 1:2/5 cm ein neuartiges Objektiv mit verbesserten optischen Eigenschaften folgen. Bald war klar, dass man für die Neurechnung ein Glas mit besonderen Brechungseigenschaften benötigte. Zu dieser Zeit kamen dafür allerdings lediglich radioaktive Gläser in Frage, was für die Fertigung bei Leitz erhebliche Probleme in Punkto Arbeitsschutz mit sich brachte. Parallel liefen daher Bemühungen im Leitz-eigenen Glasforschungslabor, ein thoriumoxydfreies Lanthan-Kronglas zu entwickeln. Dies gelang schließlich im Jahr 1952 mit dem LaK9 - dem Glas, das dem späteren Summicron zu Weltgeltung verhelfen sollte. Erste Versuche mit der neuen Rechnung B273a fanden noch auf der Basis radioaktiver Gläser statt. Nach dem Summitar* wurden noch im Jahr 1950 die ersten Muster mit dem Namen "SummiKron" (Schreibweise noch mit "K" für Kronglas) gefertigt. Die ersten vier Objektive hatten keine Seriennummern, sondern waren mit "A", "B", "C" und "D" gekennzeichnet. Historisch bedeutend!
Sehr schöner Zustand, Trübung hinter der Frontlinse.
Provenienz: Sammlung Georg Mann.
Literatur: Lars Netopil, „Museum Leica“, S. 213ff.
In 1950, the Summitar 5 cm f/2 was to be followed by a novel lens with improved optical performance. It soon became clear that the recalculation required a glass with special refraction properties. At that time, however, only radioactive glasses came into question, which meant considerable problems with OSH manufacturing for Leitz. At the same time, efforts were being made in Leitz's own glass research laboratory to develop a lanthanium crown glass free from thorium oxide. This was finally achieved in 1952 with the LaK9 - the glass that was to help the future Summicron become world famous. Initial experiments with the new formula B273a still took place on the basis of radioactive glasses. After the Summitar * in the year 1950, the first samples with the name "SummiKron" spelling still with "K" for Kronglas (german for crown glass) were manufactured. The first four lenses did not have serial numbers but were marked "A", "B", "C" and "D". Historically significant! Very nice condition, haze behind the front element.
Provenance: Georg Mann collection.
Literature: Lars Netopil, "Museum Leica", p. 213ff.
Serial Number: A
Production Year: 1950
Provenienz: Sammlung Georg Mann.
Literatur: Lars Netopil, „Museum Leica“, S. 213ff.
In 1950, the Summitar 5 cm f/2 was to be followed by a novel lens with improved optical performance. It soon became clear that the recalculation required a glass with special refraction properties. At that time, however, only radioactive glasses came into question, which meant considerable problems with OSH manufacturing for Leitz. At the same time, efforts were being made in Leitz's own glass research laboratory to develop a lanthanium crown glass free from thorium oxide. This was finally achieved in 1952 with the LaK9 - the glass that was to help the future Summicron become world famous. Initial experiments with the new formula B273a still took place on the basis of radioactive glasses. After the Summitar * in the year 1950, the first samples with the name "SummiKron" spelling still with "K" for Kronglas (german for crown glass) were manufactured. The first four lenses did not have serial numbers but were marked "A", "B", "C" and "D". Historically significant! Very nice condition, haze behind the front element.
Provenance: Georg Mann collection.
Literature: Lars Netopil, "Museum Leica", p. 213ff.
Serial Number: A
Production Year: 1950
Condition
A/B
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Leitz SummiKron 5 cm f/2 Prototype "A"
Estimate €45,000 - €50,000
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