Archived posting to the Leica Users Group, 1998/03/25

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Subject: [Leica] Eric's Greenhouse
From: Leikon35 <>
Date: Wed, 25 Mar 1998 23:12:20 EST

  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
  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