[photo-3d] Re: viewer optics. Brewster, Helmholtz, van Albada 1/2

["John Goodman" <jgood@xxxxxxxx>]

Abram Klooswyk wrote:  

> but John Bercovitz' new one (at Paul Talbot's site) is the prettiest:
> http://www.rmm3d.com/3d.encyclopedia/mounting/ViewerLensSpacing.pdf

This file was recently mentioned on the tech-3d list, and it sure 
is a beauty. The illustrations are super clear, ditto the 
explanations. Shown graphically is exactly what I was 
struggling to express with words, but more directly.

> Remember that you can burn a hole in a piece of paper with a
> magnifier, by uniting the parallel rays from the sun in the
> focal plane. ...
> (Encourage children to play with a magnifier ...)

I don't know why, but the floating magnifier in the sky scene in 
the movie Antz came to mind....   :>)

I really appreciate the helpfulness of so many people on this list.

jeg

 

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