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[MF3D.FORUM:621] Slide Bar Stereo
- From: "Oleg Vorobyoff" <olegv@xxxxxxxxxxxxx>
- Subject: [MF3D.FORUM:621] Slide Bar Stereo
- Date: Tue, 30 May 2000 18:57:42 -0700
Bill Glickman wrote:
>...it sounds like even the slightest leaf or branch being out of place
>will play havoc with ones ability to fuse subjects...
No! No! No! Don't give up on the slide bar, single camera option. Out of the
many hundreds of stereo pairs I have taken, well under 10% have any visible
motion disparity. Of those, only a small fraction are difficult to view. Of
course, I take only suitable subjects. But they are all around - it is
surprising how little the world changes in the two or three seconds it takes to
fire off a stereo pair. My biggest problem has been wind and traffic
(vehicular, pedestrian and avian, mainly). By waiting a bit, I can usually find
a lull in the motion. To keep from getting frustrated, after setting up my
tripod and camera, I set my watch to count down ten minutes. The waiting then
takes on a Zen-like calm - just taking it all in. If I do not get a lull in
that ten minute period, I figure the picture is not to be, and move on.
The slide bar is also great for closeups. Closeups are even easier to find
motionless.
>If I were to mount my two M7 80mm lenses on a view camera
>lens board, they still will not be 65mm apart, but can get to
>about 70mm. Will this extra 5mm spacing ruin the desired effect?
There is no "effect" at 65mm. I doubt you will see a difference between a 60mm,
65mm and 70mm stereo pair if you viewed them one after the other. By 100mm you
will probably see a difference, and more likely than not, the 100mm pair will
look better. If you have not already done so, shoot some (or better yet, many)
rolls of 35mm film using a zoom lens with the camera on a slide bar . Try
different focal lengths and stereo bases on subjects you typically shoot. View
the slides in a 2x2 viewer. That procedure was very educational for me.
>Any holes in my thinking?
I am afraid you will find extraordinary modifications to create a rig with 65mm
spacing to be a waste of time and money. I would suggest carrying a rig with
100mm spacing and using one of the cameras on a slide bar when coming upon a
subject that demands a shorter stereo base.
Oleg Vorobyoff
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