Archived posting to the Leica Users Group, 2012/03/28
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]For its performance it is very reasonable. My next lens purchase for the D700. Gene ----- Original Message ----- From: "Leowesson" <leowesson at gmail.com> To: "Leica Users Group" <lug at leica-users.org> Sent: Wednesday, March 28, 2012 8:38:58 PM GMT -06:00 US/Canada Central Subject: Re: [Leica] Why don't we see more large-aperture wide-angle lenses? Reasonable? 14-24 2.8. 2k. Leo Wesson www.leowesson.com On Mar 28, 2012, at 19:08, "Frank Filippone" <red735i at earthlink.net> wrote: > 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. > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information _______________________________________________ Leica Users Group. See http://leica-users.org/mailman/listinfo/lug for more information