[photo-3d] transparencies vs. prints was Re: Medium Format Transparencies Mounted As Stereocards

[boris@xxxxxxxxxxxx]

A propos advantages/disadvantages of the holmes card format stereo prints.

I completely agree that the ultimate level of detail and tonal range is
theoretically higher for transparencies than for prints.

Now that I have started making more cards, there is another thing that I've
discovered that I don't like about (print) cards.  But this will be related
to the quality of my viewer, and to color prints only.  Members of this
list, please enlighten me if this is a problem with all viewers:

Because the Holmes format places the images wider than the standard human
interocular distance, the viewer optics must have a prismatic component.
In the viewer I own personally (a 1960s vintage scope), and I expect in
most Holmes viewers, the prismatic optics create some slight chromatic
aberration, and therewith a chromostereoptic effect that lifts fields or
details with blue color and relatively depresses red features.  This is
very irritating!

(for example, in a nude the effect will make reddish nipples appear inverted.)

Of course it serves me right.  I should be shooting for and making images
for the "classic" format in B+W, right, Bill?   The effect does not appear
in B+W views, naturally, even though chromatic aberration may be apparent
along contrasty edges.

Is this problem solved in the so-called achromatic lorgnette?

I'm taking this to photo-3d as it does not relate to salons anymore.  I
invite replies there.

Boris