Archived posting to the Leica Users Group, 1997/06/12
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]- ---------- > From: Jim Brick <jim@brick.org> > To: leica-users@mejac.palo-alto.ca.us > Subject: Re: Noncoated filter > Date: June 11, 1997 11:49 PM > > At 10:42 PM 6/11/97 -0700, you wrote: > >> >uncoated. Is it less important for a filter to > >> >be coated than for a lens? > >> > >> Take it back. It will be the first surface to greet the incoming light > >> rays. If it's uncoated, a lot of scattering, reflecting, and other ugly > >> phenomenon will take place. > >> > >It seems to me that any light reflected from the first surface of the > >filter will simply be reflected back to the subject and therefore not > >degrade the picture. I can understand why the surface of the filter closest > >to the lens benefits from coating. Am I missing something? > > > > Yes, you are indeed missing something. The first surface is indeed the most > important Please explain how a photon reflected from the first surface of a filter can possibly end up on the emulsion to 'degrade the picture'.