P3D Holmes Viewer Lenses

[Dave Williams <davidrw@xxxxxxxxxx>]

I have a couple of questions about lenses for Holmes type viewers.  What
is the purpose of the prism configuration?  Can prints be viewed in a
viewer without prism lenses?  I'd like to try my hand at building a
print viewer, both for the fun of it, and because the beautiful ones I
see on the net (such as Alan Lewis viewers) are beyond my price range.

Can non prism achromats be used, and if so, what is the focal length of
the average Holmes type lens? 

Hope everyone has a ball at PSA, wish I could be there!

Thanks,
Dave Williams
Kansas City, MO


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