T3D Re: stereo math

[Tom Deering <tmd@xxxxxxxxxxx>]

>> And is any of this related to the reason why perfectly mounted slides
>> don't look right when projected?
>
>I'm not sure what you mean but I'm limited by the internal concept that
>"perfectly-mounted" means "projects well".  Can you give me an example?
>I'm sure that would clear things up for me.

I have noticed that some of my slides look great in the viewer, but not
projected, and vice versa.  Others have reported similarly.  (By perfectly
mounted, I meant that mounting was not the problem.)

So I was assuming that this same eye-angle problem: that human eyes don't
like racking in and out past some certain angular limitation.  For
instance, someone says Charles Piper recommends using a 1 in 25 rule for
handviewing, and a 1 in 50 rule "to ensure projectability".

Wouldn't the eyes move more near the front of the theatre, and less in the
back?  And wouldn't that mean the folks in back saw less depth, while the
folks in front saw too much?  That is to say, made their eyes move too much.

And come to think of it, maybe too much eye movement is why people stay
away from the closest seats in a regular movie theater.  All along, I've
assumed it was because of focussing problems.

Does this make sense?  I can see I'm struggling with the vocabulary.

Tom



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