Hi Wayne,
You hit it on the money. Such goggles would have to employ small
lenses to avoid overly extreme angles of viewing. The angles much
beyond 15 degrees would shift the peak to the left of the nebular
emission lines.


Al M

WayneH wrote in message . ..
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?

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

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