[photo-3d] Re: x-eyed viewer

["Alan Lewis" <3-d@xxxxxxxx>]

Boris wrote:
>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.

I have not tried using prisms for my "Freeviewers Assistants" so I can't
verify this but it sounds logical.  Since I used front surface mirrors in my
designs I found that there is no chromatic aberration.  In addition, using a
pivoting mirror one can view any size stereo pair from any distance.  But
there was a small amount of keystoning introduced by the angled mirror.
I would think that a fixed prism would act like fixed mirrors in that you
would only be able to comfortable fuse a stereo pair from one distance,
meaning that you would move closer or further away from the view to get it
to fuse.

>From a historical standpoint (!?) I found that using pivoting mirrors to
achieve x-eyed/parallel/over-under viewing in a single design produced very
nice aberration free images, but had the drawback of being harder to learn
to use the device.  It sounds like prism devices like the PokeScope are much
quicker and easier to learn to use but may not be as versatile.
I'm going to have to try out a PokeScope, it sounds like a neat device.  I
like neat devices.

>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).

I agree. That was my experience with my viewing devices.


Alan Lewis
3-d@xxxxxxxx
Serious viewers for serious Viewers
http://members.home.net/3-d



 

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