[ATM] RE: Optical lab testing

[Mark Holm <mdholm@telerama.com>]

> This uses colored plastic filters for viewing the sun. The ones over the 
> eyepiece have been snapped off. I have thought about taking the polarized 
> lenses out of sunglasses and placing them in front of each other rotated for 
> maximum loss of light. Would this be safe for viewing the sun?

Probably not, depending somewhat on the amount of attenuation in the 
rest of the system.  It takes a lot of dimming to make a solar image 
safe to view for any length of time.

You can get plastic films, specifically designed and tested for solar 
viewing, from a number of sources.  I think Astro-Physics sells the 
Baader AstroSolar brand.  Astro-Physics is on line.  Google to find them.

Mark Holm
mdholm@telerama.com

_______________________________________________
ATM mailing list http://www.atmlist.net/