Archived posting to the Leica Users Group, 1998/05/11
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 06:59 AM 5/12/98 +0800, Sean Dooley wrote: >I doubt very much whether the Japanese materials were from the same source, or >that their manufacturing techniques were identical, so I am sure the optical >performance of the lenses was different. Whether this means better or >worse.....well, you know what they say about beauty. I understand that, until 1950 or so, the Japanese were using Schott optical glass imported during the War and remaindered from military stocks. In other words, they were using the very same glass which Zeiss had used before the War. It is a relatively simple matter to look up the formula of a lens in a patent and to translate this by checking out the glasses listed in the manufacturer's glass catalogue. Marc msmall@roanoke.infi.net FAX: +540/343-7315 Cha robh bas fir gun ghras fir!