Re: [photo-3d] projectors/2x2/R-format/stereo window

[Mike Kersenbrock <michaelk@xxxxxxxxxxxx>]

"David W. Kesner" wrote:
> 
> Mike Kersenbrock writes:
> 
> > Keep in mind that I'm of the opinion that one can get away with murder
> > when looking at stereo slides in a viewer -- while others gag if the
> > closest-in thing is as far as 6-inches behind the window.
> 
> Two things here:
> 
> 1) It is much easier to see mounting errors in a handviewer
> than in projection. I agree that many people are not bothered

I assume you mean the opposite.  Errors are tremendously more
obvious in projection where it may actually hurt your eyes.

> by these errors, but that is different than detecting them.
> The only reason that many people find them less tolerable or
> more "easily" detected in projection is that it magnifies the
> problem.

They are less tolerable because they hurt the eyes as well
as being more obvious.  :-)

> 2) Correct me if I am wrong, but you seem to be concentrating
> on the window problem as being when the whole scene is behind
> the window. This is not what is happening when images are
> mounted with infinity seperation. What happens there is the
> whole scene is in FRONT of the window. It is the farest object
> that is set at the window.

When the window is at infinity, I would expect everything to
be in front of that window.  Quite true.  Because my camera
is built with the built-in window at infinity such is the
case.  I need to sit down and do the math for my particular
camera/viewer combo.

I just know that I look at my slides taken out of the
little yellow trays I get from the processor, I've a 3D
blast looking at them w/o having expended any time or
energy at all.  And my "sensitive-eyed" wife does too.

> Now as long as we are stating opinions *{;-) mine is that any
> mounting error is intolerable. Especially when there is
> absolutely no reason for it. Everyone has the ability to mount
> perfectly.

You say there "is absolutely no reason for it".  This isn't 
true,  and "why" actually is the entirety of my original point.  :-)

How fast do you mount your slides?  I took 32 rolls in Hawaii
a couple weeks ago.  Time for me to mount all 576 stereo pairs
is uh... zero minutes.  I pick them up locally, and put them
in the viewer.  How long does it take you to mount 576 stereo
pairs? I bet I'm faster (and I used to be much much slower than
you!).  That, to me, is a good reason.  A reason I think even
some others might appreciate.

> 
> It is hard enough to promote stereo photography with good
> images, but when poor images or improperly mounted images are
> being used to show to the public it really hurts us all. If

Public will see them remounted.  But in any case,
at least for me, I'm doing this for my own fun as first priority,
and promotion secondarily.  Even my 3D web site is primarily done
by me for fun.
 
> As far as the preset window in RBT's I guess I will have to
> check with Jon again. I know that 65mm A models (like mine) do
> have a set window. Maybe the 75mm B models don't. It won't be
> the first time I have been wrong *{;-)

Your images are 33mm wide instead of 36mm wide in mine.  If I 
were to just declare that the "inside" 3mm of each of my images
were null and void, I'd now have a camera with a built-in 
window -- and still have the same image area as your version.
In any case, it has a window, it's just at infinity.  :-)

But, as I mentioned to begin with, it's just a matter of trimming...

Mike K.

P.S. - I presume mine has no (non-infinity) built-in window because
       they'd have to shift the aperture from the center of the
       lenses, which I don't see on the camera, nor does it seem
       reasonable.  Yours is 3mm shortened, so just where they
       do the shortening will set the window.  One place where its
       infinity built-in window shows itself is when I'm doing
       realist-mount mounting, particularly with close-in shots.
       I need to use as small as a 7-P mount to shift things
       properly.