Archived posting to the Leica Users Group, 1999/07/07

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Subject: Re: [Leica] Re: Speaking of curved horizons...
From: csocolow <>
Date: Wed, 07 Jul 1999 23:04:46 -0400

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
> >


The earth is flat. The curvature is an optical illusion caused by
non-rectilinear corrected eyeballs.

- -- 
Carl Socolow