-----Original Message-----
From: Jim Gibson [mailto:xajax99@yahoo.com]
Sent: Saturday, November 22, 2003 1:45 PM
To: utah-astronomy@mailman.xmission.com
Subject: [Utah-astronomy] Roof Prosm

Chuck & Kim

I saw your post that mentioned roof prisms. I had never heard the term so I decided to google up some information. There are tons of sites talking about roof prisms and two that I thought might be of interest are included  here:

 

Roof physics
http://www.kireinc.com/english/Roof_Prism.htm

 

Comparison
http://www.birdwatching.com/optics/roof_vs_porro.html

 

After reading several articles, I am not sure how roofs differ in appearance or construction from the Porro. The roofs look just like the prisms I had in and old pair I once had.

 

Jim

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