NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: sun filters
From: Scott Owen
Date: 2008 Feb 08, 00:18 -0600
From: Scott Owen
Date: 2008 Feb 08, 00:18 -0600
Sara and Dan wrote: > Irv Haworth wrote: > >> Dan >> I am not that bright/knowledgeable, but if my memory serves me correctly >> ,ordinary glass filters out about 95-98 % of UV radiation . >> >> Irv >> >> -----Original Message----- >> From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf >> Of Sara and Dan >> Sent: January 27, 2008 9:34 AM >> To: NavList@fer3.com >> Subject: [NavList 4461] sun filters >> >> >> Does anyone know if the filters on sextants are really safe to view the sun >> through? >> If modern sextants are safe and filter out harmfull _UV_ radiation is the >> same true for older sextants? >> >> Dan >> >> > The filters on my Davis mark 15 are sheet plastic. > > Dan Dan, Here is a link to NASA and what they have to say on the subject. http://sunearth.gsfc.nasa.gov/eclipse/SEhelp/safety2.html Hope that helps. --Scott --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
