"WayneH" wrote in message
news
On 23 Sep 2003 05:56:24 -0700, (Al M) wrote:

Hi,
We've toyed about making a pair nebula filter glasses at our shop.

Al, my understanding is that its important to keep many kinds of
filters perpendicular to the light cone axis. Izzat true, and if so,
how would this impact the goggle design?

True, the more narrow the filter the more sensitive to angle of incident
(AOI)
http://users.erols.com/dgmoptics/filters.htm

Dan McShane

Wayne Hoffman
33° 49" 17' N 117° 56" 41' W
"Don't Look Down"

http://home.pacbell.net/w6wlr/


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