Archived posting to the Leica Users Group, 2003/08/26
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]on 8/26/03 6:28 PM, Marc James Small at msmall@infionline.net wrote: > Note how many of the Leitz and Contax lenses made > before the War stop down only to f/8 or f/9 or so, as the manufacturers > were concerned over diffraction degradation beyond that point. (The Zeiss > Jena 1.5/5cm Sonnar, for instance, went from f/8, f/11, f/16, and then f/22 > between 1937 and 1945, as the effects of coating were confirmed to combat > diffraction effects. My oldest of these lenses is a quite early coated > one, but only stops to f/11.) > > Marc > How would coatings change diffraction effects? I thought internal reflections and diffraction were completely independant. Doug Herr Birdman of Sacramento http://www.wildlightphoto.com - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html