[photo-3d] x-eyed viewer

[boris@xxxxxxxxxxxx]

Gabriel,

yes I do have a prototype cross-eyed viewer (in the form of glasses
actually) that Alan Silliphant made.

It does work well, considering the limitations.  It is prismatic.

In general, to get a prismatic viewer to work on cross eyed pairs, the
prism factor has to be larger than would be necessary for traditional LR
pairs.  This means that the prism needs to be thicker, and that it would
produce more chromatic aberration.

And indeed these are the drawbacks of the Silliphant glasses: heavy prisms
and chromatic aberration.

Contrary (I think?!) to what Monte Ramstad said, there is a difference
between web images and print.  That is in the resolution.  Screen
resolution is so poor, that standard pairs show hardly any detail at all.
I put my pairs on the web cross eyed to be able to show more detail.  Cross
eyed freeviewing is necessary and possible with relatively large images
(albeit for only half the population).

Availability of a viewer is irrelevant in this reasoning.  (Note also that
the inexpensive lorgnettes available for LR print pairs do not work with
the relatively larger on-screen pairs that I would want to show).

Boris

P.S.  all that said, I do love my pokescope.  As another poster said, it
does exceed one's expectations - with its ingenious design becoming
apparent only with repeated use.



 

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