Re: [photo-3d] Re: Vertical 2x2 in R-mounts

[Linda Nygren <lnygren@xxxxxxx>]

Paul Talbot wrote:

> Linda Nygren wrote:
>
> > Looking at my Red Button viewer, it looks as if you
> > could eke out a vertical of about 7p or 28 mm (possibly
> > as much as 29mm but that is iffy), and your custom mount
> > aperture could have a width of 23-24 mm.  The bottom of
> > the mount would be about 7mm and that would leave about
> > 6mm for the top to stay within the standard 41 mm overall
> > height for the mount. Not bad.
>
> Linda, were you assuming no modification of the viewer
> when you came up with those numbers?

Yes, I was assuming no modifications, and was suggesting that even an
unmodified Red Button could possibly handle 7p vertically pretty well. In
fact, if I take a 7p Spicer mount and put it in the Red Button vertically,
it seems to just fill the field of view (23 mm x 28 mm). It needs to be held
a little higher in the viewer than the position the 6mm edge would give you
automatically; about 7mm looks like it would be right for the "bottom" edge
of the new mount.

>
>
> > Would it be possible to modify a Red Button for 8p
> > vertically???
>
> DrT replied:
>
> > I have done it twice for a customer who asked for it.  As I
> > recall, it worked reasonably well, except you could see
> > some of the inner workings of the viewer (focusing shaft)
> > which was mildly distracting.
>
> What would be a reasonable maximum vertical opening, in
> your opinion?  Would one be better off keeping the size
> to somewhere in the 28-33 mm range?  Most people don't use
> more than 31.5mm for their full frame horizontal stereo
> shots.
>
> Linda again:
>
> > The mount would probably need to be a
> > little taller than 41mm for this to work.
>
> Could you explain why you think it needs to be taller?

I just meant that the top margin of the slide might be too thin with "full
frame", and it might work better/ be sturdier if it were a little taller. It
doesn't seem that it would be a problem if the mount were a little taller;
it would not need to be as tall as the old Radexes (about 71 mm) but just a
little extra height might be OK, except perhaps for competitions.

I am not sure how we are defining "full frame"; I realize the the neg itself
is probably 24 x 36;  full frame single mounts are usually 23 x 34mm?  (The
GEPE I have here that I measured was this size.) The 8p spicers have an
aperture of 23 x 31.5mm. The 7p's appear to be 23x 28. In a vertical format,
the 7mm on the bottom plus *34 mm* aperture height would use up all of the
41 mm mount height unless you added a little for the top margin. I would
personally might be interested in trying a 28 mm aperture height (7p
vertical) ; others might want closer to full frame (for projection with a
TDC 116 or use in a modified viewer) if they don't mind an oversized mount.
Admittedly, many people probably do crop their full frame shots down to 31.5
in horizontal format anyway but part of this is for adjusting the window
which wouldn't apply here on the vertical dimension.

Speaking of this, would a narrower aperture (e.g 21 mm or so ) be better
than 23mm for the width, both for allowing window adjustments (since many
portrait subjects may be fairly close up) and to improve the height to width
ratio?    -Linda



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