Archived posting to the Leica Users Group, 1998/06/06
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 09:32 AM 6/6/1998 -0700, Paul and Paula Butzi, you wrote... >Do you know, off hand, what the wavelengths for C, D, and F are? > >-Paul C = 6562.816 , red, Hydrogen D1 = 5895.944, yellow-orange, Sodium D2 = 5889.977, " " F = 4861.344, blue, Hydrogen I think Erwin's saying (please correct me if I'm wrong!) that when aberration is zero at the C and F lines, the wavelengths between are corrected, but not necessarily zero. Zero aberration at the D lines would greatly improve correction at the other wavelengths. I was surprised that wavelengths beyond red and blue weren't chosen for correction since films have sensitivity beyond that range. Should we be using UV filters to improve sharpness? ;-) - -Mike