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I've recently been asked (and been wondering about it myself for quite some time) what designs the Elmarit-pro projection lenses are in terms of design. I think part of this was posted here in the forum from some Leica brochure: https://reconact.de/rolleivision/wp-content/uploads/2021/05/Leica-Pradovit-Katalog-ENDE-2003-.pdf

Zitat

Eine komplette Leica Neuentwicklung, die in dieser Brennweitenklasse neue Maßstäbe setzt. Die großartige Abbildungsleistung des 120er Elmarit-Pro erreichten unsere Konstrukteuer durch eine andwendige Optikrechnung und den Einsatz spezieller Gläser in Verbindung mit ganz neuen Fertigungstechnologien.

and about the 150 mm variant:

Zitat

Wie das 120er Elmarit-Pro ebenfalls eine komplette Neuentwicklung. Die gleichen Gläser mit anomaler Teildispersion, die beispielsweise im vielgelobten Kameraobjektiv LEICA APO-SUMMICRON-R 1:2,0/180mm verwendet werden, geben auch diesem Objektiv höchste Abbildungsleistung.

There are a couple more mentions about certain design features of lenses in that series, but in most cases no mention of the optical construction (elements/groups) etc. and I also wasn't able to spot any lens diagrams so far. So if anyone here knows anything about those aspects, I would really love to know more about that!

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