That's very reassuring to know. John
John Whittingham Technician ---------- Original Message ----------- From: "Peter J. Alling" <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] Sent: Sat, 19 Jun 2004 20:39:54 -0400 Subject: Re: Viewfinders > Pentaprism. > > John Whittingham wrote: > > >While your on the subject, what's in the MZ-3? > > > >John > > > >John Whittingham > > > >Technician > > > >---------- Original Message ----------- > >From: graywolf <[EMAIL PROTECTED]> > >To: [EMAIL PROTECTED] > >Sent: Sat, 19 Jun 2004 19:05:01 -0400 > >Subject: Re: Viewfinders > > > > > > > >>A pentaprism is a 5 sided solid glass prism. A penta mirror is a 5 > >>sided hollow equavalent made up of platic mirrors glued together > >>along the edges. Both reflect the image multiple times ending up > >>with the image from the reflex mirror right side up and right way > >>around. The advantage of the glass prism is it has very good light > >>transmission. The advantage of the mirror prism is it is light > >>weight, and can be made cheaply if desired. > >> > >>A well made (expensive) porro prism (another name for a mirror prism) > >> is almost as good as a good glass prism (they use them a lot in > >>binoculars). A cheap poorly made porro prism is a piece of junk. > >> > >>-- > >> > >>Joseph Tainter wrote: > >> > >> > >>>"1. Penta Prism (old and/or expensive) vs Penta Mirror (modern and/or > >>>cheap) - construction." > >>> > >>>Thanks, Boris. Those were the terms I was looking for. > >>> > >>>But what is the difference between prism and mirror viewfinders? Don't > >>>prism finders use mirrors? > >>> > >>>Joe > >>> > >>> > >>> > >>> > >>-- > >>graywolf > >>http://graywolfphoto.com/graywolf.html > >> > >> > >------- End of Original Message ------- > > > > > > > > ------- End of Original Message -------
