Archived posting to the Leica Users Group, 1997/09/16
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]If by real you mean the actual Transmission (T stop) rather than the computed (focal length divided by diameter) then those figures sound reasonable. Even with the best of coatings, there is always a minor transmission loss. Years ago, marking the actual "T" stop on the lens was tried but somehow no one really was interested. Marvin Moss ++++++++++++++++++++++++++++++++++++++++ In a message dated 97-09-16 03:29:52 EDT, you write: << >Subject: real aperture of Noctilux >I've read on a book about Leicas the real aperture of the Noctilux 50/1 is >1.17 and the real one of the 50/1.2 is 1.3. >Can anybody confirm that? > >Thanks in advance > >Ernesto > >>