Re: Hyper vs long focal lengths

[P3D John Bercovitz <bercov@xxxxxxxxxx>]

> Shouldn't longer lenses limit the hyper-stereo effect when
> shooting landscapes and subjects at a distance? And the
> hypers I've seen don't seem "flattened" just "shrunken"
> which is what you're saying, but why don't they get flat at
> a distance like "standard" 3-d? Some of the Cloud hypers in
> photo 3-d seemed to have depth all the way to infinity.
> Perhaps I'm confused ... (so what's new?) Please help me
> out here.

Take a look at a hyper of some mountains shot with _long_ lenses
and viewed in a normal viewer.  The mountains look impossibly 
steep (violate the angle of repose) because they are shortened
in the 3rd dimension.  It's really obvious when it's something
familiar.  Clouds?  I don't know too much about what a cloud
should look like so if it's flatter than it should be, I don't
think I'd know.  You have mountains up there.  Go up to the top
of one and take a picture of another one perpendicular to its
ridge with a stereo base of, say, 50'.  Use at least a 100 mm
lens.  You'll see what I mean because you know mountains aren't 
that steep even if it feels like it when you climbing them.

The hyper effect is separate.  It shrinks stuff equally in all 
three dimensions.  Of course it also is added to the flattening
effect from mismatched camera and viewer lens lengths.

None of this affects infinity.  It just changes the scales.

John B


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