Archived posting to the Leica Users Group, 1998/06/02
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Marc James Small wrote: > > Patrick > > Eastland's book is so laden with error that I do not regard it as an > acceptable source for any proposition! I agree with you on that -- but you cited it! But let's talk about Guenter Osterloh, a product manager at Leitz in Wetzlar and also an instructor at the Leica Academy. Surely this is a man in a position to know whether Leitz ever melted the glass for some of the elements of some of the production lenses. He says: "To this day, Leitz itself produces only relatively small amounts of six to eight tons of special glasses. Among them are glasses with anomalous partial dispersion, which possess certain qualities of crystals, and which are used in 180 mm f/3.4 APO-Telyt-R and 800 mm f/6.3 Telyt-S lenses." - - Guenter Osterloh, "Excellence in Photography: Applied Leica Technique," p. 15, 2nd English-language edition, Umschau Verlag, 1985. I only consider it important to nail this down because Marc is one of those industrious people who's liable to go and write a book about things like this, so we have to make sure he hears all the evidence! - -Patrick