Archived posting to the Leica Users Group, 1999/09/23
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]From: Erwin Puts <imxputs@knoware.nl> Sent: Thursday, September 23, 1999 22:34 Subject: [Leica] Noctilux pipe dream > The Noct as it is by now is the best the designers > can compute. Is computation the limitation? The Leica book I have says that the Noctilux somehow approaches some sort of limit, but doesn't explain exactly which limit is being approached. I assume they were talking about some sort of physical limit or optical limit. What exactly did they have in mind? I understand that extremely fast lenses are very difficult to produce, but what makes them so? I once heard that someone (Canon) had once marketed a lens with a maximum aperture of 0.7. Is this true? Another book I read says that the theoretical limit is 0.5. Is this correct? If so, what imposes that limit? -- Anthony