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[MF3D.FORUM:814] Re: I need a MF 3D Dr.


  • From: "don lopp" <dlopp@xxxxxxxxxxxxxxx>
  • Subject: [MF3D.FORUM:814] Re: I need a MF 3D Dr.
  • Date: Wed, 21 Jun 2000 14:14:56 -0700

Try looking at a coin and seeig both sides at the same time . It's not
easy.Don
----- Original Message -----
From: "Dr. George A. Themelis" <DrT-3d@xxxxxxx>
To: "Medium Format 3D Photography" <MF3D.Forum@xxxxxxxxxxxxx>
Sent: Monday, June 19, 2000 8:07 PM
Subject: [MF3D.FORUM:797] Re: I need a MF 3D Dr.


> >Drawing on an example I
> >was given, let's say the closest object in a scene is a coin
> >standing on edge, thin edge toward the camera.  Say the physical
> >depth in the scene is not very great, and the scene is fairly
> >close.  The MAOFD formula may yield a stereo base that is
> >significantly larger than 1/30 the distance to the near object.
> >It is possible that the left camera will see the "heads" side of
> >the coin, while the right camera sees the "tails" side.  When
> >you go to view the two images in 3D, there will be problems,
> >even though the MAOFD has not been exceeded!
>
> Two comments on this:  The coin that stands on its thin
> edge toward the camera is not a particularly good example
> of a subject with limitted depth, especially if photographed
> in a close up. Standing on its face would be a better example
> but then it does not have the problem you described.  The other
> comment is that when our eyes look at the coin on its side,
> we do not seem to be bothered by the fact that the left eye
> sees quite a bit of the left side and the right eye
> sees quite a bit of the right side.
>
> >Extending the example to more likely real situations, it is
> >easy to see that if the base is so large as to see different
> >sides of a near object, fusing the two chips into a pleasing
> >3D image could be quite difficult or impossible.
>
> I would think that the stereo base would have too be way
> too large for this to be a problem in a practical situation
> and you will first ran into other problems (like insufficient
> overlap between R and L).
>
> >From DrDave's posting it seems that mounting was the problem
> here.  Our club's newsletter had a nice write up on the stereo
> window.  I will send Bill a copy.  I think it will clarify
> a few things about mounting and the stereo window.  Also,
> in NSA DrDave will demonstrate mounting of stereo slides.
> Perhaps DrDave or Paul can include MF mounting as an example?
>
> George
>