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 -------
