NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: (Fwd) The Most Anomalous Refraction Yet or What ?
From: George Huxtable
Date: 2009 Aug 4, 20:02 +0100
From: George Huxtable
Date: 2009 Aug 4, 20:02 +0100
> Greg Rudzinski wrote- > > "Even just the camera held to a single pane window surface and cocked > slightly would create multiple reflections." And I had commented- > > Not if the glass itself has its surfaces parallel, in which case, for an > object seen at infinity, the two images coalesce exactly, just as they do > in > the case of the two reflections from a back-silvered sextant mirror.. Such > a > displacement as Greg describes calls for some degree of "wedginess" > between > the surfaces. Now Greg replies- "If you can get your hands on a DSLR digital camera with a clear UV filter screwed snug to the lens then look through the view finder at a bright desk lamp through a window with the front of the lens touching the window and tilted to one side or the other then you will see the displacement effect. " Yes, indeed you will, in the case of the close-by desk lamp. But not in the case of an object at infinity, such as the Sun (as I wrote). Greg should try the experiment to see. George. contact George Huxtable, at george@hux.me.uk or at +44 1865 820222 (from UK, 01865 820222) or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK. --~--~---------~--~----~------------~-------~--~----~ NavList message boards: www.fer3.com/arc Or post by email to: NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---