Archived posting to the Leica Users Group, 1998/05/12
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Nikon began making its own glass in 1918 - maybe it was this they had in storage until 1950. - ---------- > From: Marc James Small <msmall@roanoke.infi.net> > To: leica-users@mejac.palo-alto.ca.us > Subject: Re: [Leica] Copy Superiority/lack thereof? > Date: 12. toukokuuta 1998 6:30 > > 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!