NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: EBBCO/filters
From: Michael Daly
Date: 2007 Nov 21, 23:15 -0500
From: Michael Daly
Date: 2007 Nov 21, 23:15 -0500
Peter Fogg wrote: > Hmm. My understanding is that a thin sheet of plain old ordinary transparent > glass is quite an effective UV filter - and that UV filters made for use in > front of camera lenses consist of little (if anything) else! I don't know that that's a safe assumption. Plain glass absorbs higher energy UV well, but not lower energy. Given that blue light can do as much damage to the retina as low energy UV, I'd only recommend a certified, high-absorption UV filter material. Mike --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
