P3D Re: 6x9cm stereo viewer: is it possible; has it been done?

[Greg Erker <erker@xxxxxxxxxxxxxx>]

>Hi.
>
>Would love to view stereo pairs of 6x9cm chromes in a handheld viewer.
>Perhaps 6x7 is the limit without the use of some pretty fancy mirrors and a
>prism. It seems to me that the center-to-center base of two 6x9 images side
>by side is larger than the average human interocular. I wonder what the
>smartest solution to such a problem would be. Is it a foolish idea? Has
>anyone tried it?

  Well, 6x7 or 6x9 in portrait mode should work.
But in landscape mode even the 6x7 might be wider
than your eyespacing unless you have very wide
set eyes.

  One solution is a Wheatstone viewer like Daniel
Greenhouse made:
http://www.skep.com/3d/gallery.htm

  He shoots 6x7 but 6x9 should be equally
"easy" to do this way.

  Another is to use viewing lenses spaced
further apart than your eyes (like in an
old stereoscope) to allow viewing of pairs
with wider than eye spacing. The biggest
problem with this is that you'd likely
want viewing lenses in the order of 80 to
100mm fl and it may be hard to get ones
of large enough diameter to use them at
wide spacing. You may have some success
if you use two lenses per eye. This is
more costly but then you might be able to
find lenses of 60mm diameter with 150 to
200mm focal length.

Greg E. (6x6 is big enough for me :)