P3D Re: 59, 65, 70, 75 mm???

["Kersenbrock, Michael" <michaelk@xxxxxxxxxxx>]

"Dr. George A. Themelis" wrote:
> 
> 
> How about the matching of the focal lengths of taking and viewing?
> We can take it for granted that the pictures taken with the usual 35
> mm lenses in the stereo camera will be viewed with 45 to 50 mm
> lenses in the viewer.  This introduces some stretch that might be
> noticeable in portraits and other sensitive situations.
> 
> In these sensitive situations, less is better.  The 59 mm of the S1
> has an advantage over the Realist or other wider interaxial spacings.

Could you explain this further?  I think I'm a bit confused.

It seems to me that the fixed (wide angle) lens in the S-1 provides
an increased sense of depth when viewed with the longer f.l. lenses
typically found in viewers (as described above).

RBT cameras such as the X2, X3, and X4 are (I assume) often sold
with zoom lenses and/or with "normal" (50mm) lenses where the 
camera f.l. can be near or exactly on the viewer's lens f.l., thus
giving the capability of "ortho" in the X2,X3, and X4 models should
the user choose to do so (or even make the f.l. a bit longer than
the viewer's to reduce the effect of the larger interoccular).

So, is the interoccular "error" in the Xx models a greater error
than the f.l. "error" that the S-1 has?  How does one evaluate
and directly compare these different "error" sources?

I don't mean any sarcasm, I'm trying to evaluate
the models (between S1 and varisous X3's) in order 
to pick one, and I'm just a little confused.  Some of
the above musings are somewhat on the theoretical side,
which is why I also ask in terms of what users of those
cameras actually do or have problems with (or don't
have problems with).  Even if theory spots a potential
"weakness" it may not be one in practice. :-)

Mike K.


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