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

[Paul Talbot <ptww@xxxxxxxxx>]

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?

> 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?

It is true that some of the thumb hold area could stick
up out of the viewer and still be usable.  
 
> I think that the TDC 116 carrier would accommodate a
> full frame vertical, but someone who actually has one
> can confirm whether this is true or not.

Here is what I have for one carrier: roughly 25x25mm.  I
know some people widen their carrier apertures, but I
don't see a lot of room for vertical enlargement.

There are a lot of different sizes of aperture openings
in TDC carriers.  Does someone have a comprehensive list?

I recently saw a TDC carrier that had two openings that
looked to be roughly square, but large enough to handle
full frame horizontally and vertically.  How common is
that carrier?

Paul Talbot

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