P3D Working with unequal image sizes (Was Re: Matched lenses in stereo)

[Paul Talbot <ptww@xxxxxxxxx>]

abram klooswyk wrote:

> Greg is right of course in pointing out the mounting
> difficulties of unequal image size, which seem to
> contradict the large tolerance of the eyes.
> The contradiction comes from mounting unequal image
> sizes in exactly equal mount openings.
> When you would mount 2% larger left images consequently
> in 2% larger left mounts, only the projectionist would
> complain. (Skip this unpractical nonsense :-))

On the more practical side, suppose one is in fact stuck
with stereo images of unequal size and wants to make the
best of the situation.  One approach would be to align
objects at the bottom and let the objects at the top fall
where they will.  If there is a significant amount of sky
at the top of the scene, the image size difference might
go undetected.

But what if the scene contains distinct objects from top
to bottom?  It seems to me it would be less strain on the
eyes to vertically align some object in the middle of the
scene, so that the size difference is split in two, and
falls half above and half below the center.

Thoughts on whether this is good or bad reasoning?

Paul Talbot