Archived posting to the Leica Users Group, 2012/03/28
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]The true normal for the 35mm film and digital full fame image circle is 43mm. So a 43mm lens would be true normal not a 50. But 50 is close enough. As is 45, 40 or 35 even. A normal lens is easier to make than a wide or tele. Its easer to make sharper. Its easer to make lightweight and compact. And because of some of these reasons its easier to make in a higher speed version. -- Mark Rabiner http://gallery.leica-users.org/v/lugalrabs/springdays/ > From: Adam Bridge <abridge at mac.com> > Reply-To: Leica Users Group <lug at leica-users.org> > Date: Wed, 28 Mar 2012 12:10:48 -0700 > To: Leica Users Group <lug at leica-users.org> > Subject: [Leica] Why don't we see more large-aperture wide-angle lenses? > > Just curious. Since we were talking about the Nokton lenses. > > I have a Noctilux f1.0 50mm and a CV 35mm f1.2 > > But as you head toward 28mm or 24mm it's f3+. > > As focal length increases above 50mm there aren't many fast lenses either. > > So, why the sweet spot between 35 and 50mm? > > I'm sure there are optical wizards who can explain this. > > Thanks! > > Adam > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information