P3D Re: Ortho and TDC

["Dr. George A. Themelis" <DrT-3d@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

>Ortho is way up there at 5.5 feet and I'm way back here at 22.7.  
>Does this mean my z-axis suffers 400 percent distortion, or is 4x
>distorted?

It is hard to quantify a visual perception issue, but, yes, if
you want a number, that is 4x.

>I calculate that my projection lenses need to have about a 1.2 inch 
>focal length...  

I'd save you the calculations by telling you that the projector 
lenses must be the same FL as the taking lenses.  So, if you used
a Realist equivalent camera with 35 mm lenses, you will need a 
projector with 35 mm lenses (1.4 inches).  These are hard to come
by :-).

Michael, just relax and enjoy your stretchoTDC! :-)

George


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