Archived posting to the Leica Users Group, 2012/03/28
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Nikon and Canon both sell them....at reasonable prices.... They must be retrofocus lenses to work on an SLR. Maybe the problem is ... reasonable prices.... Frank Filippone Red735i at earthlink.net To do a wide angle fast lens, you will need retrofocus design, even for rangefinder where there's no mirror box. The mostly symmetrical designs like the Biogon do not scale to fast aperture. If I understand it correctly, a retrofocus would be like putting a reducer at the back of a longer than wide angle lens, thus adding complexity. And since fast lens make the aberration situation worse, further complex design is needed to control them. So it's sort of like a double whammy.