Auteur: Dan Fromm
Date: 14-11-2009 21:38
Didier, pardonnez mon anglais.
The f/4.5 Biogons we're talking about here were all made to the same prescription. It can be found in US Patent 2,721,499, downloadable from www.uspto.gov. To see the images you'll need a .tif reader. I use Alternatiff, a free download.
The lens' dimensions -- elements' radii, elements' thickness and diameter, and spacing scale with focal length. The example shown in the patent gives dimensions for a 100 mm lens, all of a 53 mm lens' dimensions are 0.53 times the dimensions given.