Archived posting to the Leica Users Group, 1999/07/07
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Roger Beamon wrote: > > On 7 Jul 99, Nathan Wajsman wrote, at least in part: > > Good observation. Even after putting the straight edge on it, it still > looks a bit curved, though. Of course, being night time, we dont > know for sure where the horizon is or if the lights are truly > representative of the horizon. > > Still, could it be the curvature of the earth, assuming no barrel > distortion, at that distance? > > > Roger, > > > > I do not believe it is lens distortion. The horizon is actually > > straighter than it first appears (try putting a ruler against it). It > > appears curved because there is less light at the edges, especially on the > > left side of the picture. > > > > Nathan > > Roger, The earth is flat. The curvature is an optical illusion caused by non-rectilinear corrected eyeballs. - -- Carl Socolow http://members.tripod.com/SocPhoto/