Archived posting to the Leica Users Group, 1999/05/18
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Marc, What about the Steinheil Periscope lens of 1865? Or the Globe lens of Harrison & Schnitzer (1860)? They were mathematically calculated and produced by their respective companies, and this would appear to precede Zeiss and Voigtlander again. Additionally, by 1866 there was much theoretical (mathematical) work done in the design and development of rectilinear lenses. Please tell me what point I am missing? Confused, Peter K - -----Original Message----- From: Marc James Small [mailto:msmall@roanoke.infi.net] Sent: Tuesday, May 18, 1999 12:23 PM To: leica-users@mejac.palo-alto.ca.us Subject: RE: [Leica] Using old lenses Pete Your basic point is perfectly correct. Nonetheless, the use of mathematical calculations at both Zeiss and Leitz in the 1870's was the first time a manufacturer of such lenses had used such to design production lenses. Petzval and Wollaston operated on their own and looked to others to produce their designs. Marc msmall@roanoke.infi.net FAX: +540/343-7315 Cha robh bas fir gun ghras fir!