P3D Re: slide bar

[Steve Berezin <sbere@xxxxxxxxxxxxx>]

Dr. George A. Themelis wrote:
> 
> Steve Berezin asked me to elaborate on this:
> 
> >Moderate hyperstereos (in the order of a few times the normal 65 mm)
> >in my opinion are pretty much useless.
> 
> I know it sounds very provocative as a statement, but here is my
> reasoning:  Our eyes are spaced on the average 65 mm apart.
> There are many situations where we would like to shift the camera
> less than 65 mm.  Close-ups, macro stereo, excessive depth in the
> scene, etc.  I cannot think of any practical situation where 120 mm
> would do it, while 65 mm would not.  Can you?  If the subject is far
> away and a hyperstereo is needed, usually this would be quite a few
> times the average interocular and not just two.

I agree 120 mm is not much.  The home made drawer slide slide bar I
cobbled together however can do hypers of 30 to 40 cm's in seconds. It
can also accurately do a few mm. I think some other drawer slides can
extend to 60 or 70 cm with a very smooth action. All that is needed is a
drawer slide, a 1/4-20 T-nut, a 1/4-20 bolt and a couple pieces of wood,
(if anybody is interested I can put the plans on a web page).

-- 
Steve Berezin
mailto:steve@xxxxxxxxxxx


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