[MF3D.FORUM:396] Re: fl/30

[Tloc54452@xxxxxxx]

>      Sorry I did not properly quantify my question... I meant this...
>if you only view MF stereo pairs in a viewer, no projection, then using your
>formula, should I keep the deviation constant?  If so, should it be 2.7?

If your lenses, in camera and viewer, are 80 mm, the max OFD should be
80/30 = 2.7 mm.  That's a general number that people like Bob Mannle use
for all purposes, regardless of focal length.  I don't know if that's wise or
not.  It seems to work well enough to satisfy many people.  Realize that 
this is a maximum OFD.  Nobody says you must go this high for every shot.

Personally, I don't do it this way.  My regular slide bars have 67 mm of
travel to match my IPD.  My camera and viewer lenses are 80 mm.  So I
get the ortho view every time.  This means height, width, and depth
have the same proportions in the reconstructed image and also the scale
of the reconstructed image is the same as that of the original.  Personally,
I think it's the onliest way to go.  8-)

There was a long discussion on P3D years ago about whether or not
everyone can see stereo errors (non-orthoscopy).  I don't know, but 
many people can.

John B