Archived posting to the Leica Users Group, 2001/02/16
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Andy, The inverse quare law only applies to point light sources in a vacumn. The atmosphere is filtering out a whole lot of UV and visible light. This is why skiers and mountaineers put on suncreen when they are at alitude, something they do not need to do at ground level. Jonathan - -----Original Message----- From: A. H. Ongun [mailto:ahongun@ecsysinc.com] Sent: Friday, February 16, 2001 11:12 AM To: leica-users@mejac.palo-alto.ca.us Subject: RE: [Leica] photography at altitude In proportion how negligeble is 5000-8000ft as far as distance from the sun to earth is concerned? Think inverse square law... andy - -----Original Message----- From: owner-leica-users@mejac.palo-alto.ca.us [mailto:owner-leica-users@mejac.palo-alto.ca.us]On Behalf Of Lee, Jonathan I'm off for some skiing at Banff (elevation 5000-8500ft).... In case the meter goes belly up, does the sunny f16 rule change appreciably at these altitudes? Thanks Jonathan Lee