Archived posting to the Leica Users Group, 1997/08/11
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]In einer eMail vom 11.08.1997 18:54:55, schreiben Sie: >I always thought that the "normal" lens was one where the field of view >most closely matched that of the human eye. For the 35mm format I >understood this to be a 35mm lens, for 4x5 a 6" lens. The 50mm focal >length for the 35mm format is a slight telephoto. My "normal / standard" >lens is a 35mm f/2 Summicron. > > If you take those standards, then you are almost true: the 50 mm covers the angle of the human eye, while the 90 mm covers the perspective of the human eye. So, which is your standard? The optical standard for a "normal" lens is given by the equation I sent recently (in short: the standard normal lens agrees to the length of the diagonal of the negative format). - -Alf