Archived posting to the Leica Users Group, 1998/01/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Jim Brick wrote: > > At 08:57 AM 1/13/98 -0500, you wrote: > >Excerpts from mail: 12-Jan-98 [Leica] Leica-Users List Di.. by > >Listmgr@mejac.palo-alto. > >> For Leicas, it's the fact that a portion of the incoming light is directed > >> through a partially silvered mirror (the SLR mirror), for exposure > >> determination. The partially silvered mirror (beam splitter) acts as a > >> polarizer and will give incorrect exposure readings with a linear > polarizer. > > > >Well, I dunno about Leica Rs, but I talked with - gasp! - Nikon about my > >old F3, which also uses a part-silvered mirror spot in the metering > >system. They assured me that linear polas were fine; and indeed, I seem > >to have no trouble using one. So, are there other factors present that > >mandate circulars for some cameras but not for others? > > > > For Leicaflex & R cameras, simply read the Leica literature and it will > tell you exactly what I said. I didn't make it up. > > End of subject. > > Jim As far as I know the Nikon F3 doesn't use a partially silvered spot. What it uses is thousands of non-silvered holes in the silvering of the main mirror, in a keyhole shaped array (if memory serves me well). Amilcar