[photo-3d] Re: using shift/tilt for stereo

["Robert J. Vaughan" <k0mz@xxxxxxxx>]

On the subject of shift/tilt, we must remember that shift movements are
to change perspective and tilt movements are to control focus, two
different operations.  I have many 90+ year old Underwood views of
architectural subjects that were obviously made with a shift camera as
the verticals are parallel instead of angled in at the top with the
keystone effect and the views all look very correct and natural.  I don't
hesitate at all to use my shift lens for stereo when I want to exercise
that type of correction.  Tilt movements with the scheimpflug principle
are used to make near and far subjects one side to the other together
both in focus across the picture plane.  
Robert J. Vaughan

- shift/tilt capability would be useful, I think.  Has 
> anyone
> >shot with shift/tilt in stereo and what pitfalls await me there?  
> Does 3d
> >viewing make shift/tilted images look even more strange than they 
> already
> >do flat?
> >
> > The "general wisdom" as I understand it is that shift/tilt
> > adjustments should NOT be used for 3D photos.  The distortion
> > of the lines from tilting the stereo camera looks perfectly
> > normal when viewed in 3D.  If you straighten the lines in the
> > scene it sends confusing signals to our brains when viewing
> > the photo in 3D!