Archived posting to the Leica Users Group, 1998/03/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Of course the radiation is stronger above the ozone layer - haven't you ever heard of the greenhouse effect Erik? The various frequencies of UV radiation and different properties of UV absorbtion in crown, flint, quartz & flourite glass has already been discussed. Marvin (sunburned) Moss ======================================================== In a message dated 98-03-25 22:49:34 EST, you write: << I think plain glass filters some UV, but not all. For example, even Leica will tell you at extremely high altitudes the UV light is so strong that a UV filter will improve things. Eric Welch St. Joseph, MO http://www.ponyexpress.net/~ewelch