[photo-3d] Re: Base Calculators

[Michael Watters <michael.watters@xxxxxxxxx>]

> "Not a problem" in a hand viewer?  Is Mr. Themelis suggesting that 
> people can diverge their eyes more easily with a viewer?  Or that it 
> doesn't hurt as much?

I'd lay most of the blame on the polarizers used in 
projection.  In a viewer, each eye sees ONLY a single view, 
which lets you get away with a LOT of stuff including 
ultra-high contrast images and extreme 'p' values.  In a 
projected image you're always stuck seeing two images with 
each eye.  The polaroids filter out MOST of the alternate 
image, but there is always some crosstalk.  That's going to 
make projected images much more sensitive to extreme 
contrast or borderline p-values.

Similar story with a viewer Sawyer made for looking at flat 
slides with both eyes.  (It uses a 50-50 beam splitter to 
divide the image)  Most slides look just fine, but if you 
stick a high contrast slide (night shots of lights) in the 
thing there's ghosting all over it because of reflections 
off of the 2nd (non-silvered) surface of the beam-splitter.

Mike

-----------------------------------------
Dr. Michael Watters
Email: Michael.Watters@xxxxxxxxx
Valparaiso University