Slides realistic???

[P3D Gabriel Jacob <jacob@xxxxxxxxxxxxxx>]

Okay some people get 3D slide viewing confused with reality. 
That is I guess an admirable goal in taking 3D pics but I think
(now this is a personal opinion and from personl experience) that
no matter how sharp and good the slide and viewer is, one will
APPROACH this goal but will never actually attain it. The reason
being is because the focussing of the eye muscles gives a clue that
the image is not at the depth it's supposed to be. Especially when
focussing at close distances such as in viewers. At farther distances
the eye muscles don't play as an important factor, in the brain
determining the distance. This is a subtle clue but nonetheless
important one at close distances.

That is why there is a certain appeal to projected 3D images, not
really because of the "size" but rather because of the longer "F.L."
The eye as described above is easy to fool but not in this case. 
For example take a printed image that is a few inches in size and
one that is much larger. Stand way back and view the poster and
then bring up to your eyes the small pic so that the image is the
same size as the poster to your vision. Even though the image is
now the same size as the poster, your eyes (brain) knows and is
sensed as being smaller, regardless of the size viewed being equal.
This again is because of the close proximity of the smaller image
and the eye muscles clueing the brain of this close proximity.
I think this works only for a couple of feet.

Let me elaborate with another similiar example. If one has a copy of
a 3D slide (or even a 2D slide), take one of the slides and project
it on the screen to an appropriate large size. Now view the same
image (a copy) in a viewer but with only one eye. The image will
appear at a certain distance and size in the viewer. (for a 2D, think
of looking at a flat image at a distance) Now for the next part, one
has to be adept at freeviewing. Still looking at the image in the
viewer move back and forth till the image in the viewer is the same
size as what is on the screen. When that happens the image in the
viewer will take the appearance of being much bigger than it was
without looking at the projected image. This works regardless of
eye dominance. There has been remotely related discussion about
this before I believe but not in this fashion.

If one doesn't have a projector to try this, they can easily also
try it with a viewer and a scanned image viewed from a computer 
monitor. I have 2D slide pics of people for example and when viewed
through a one lens viewer (or even two lens 2D viewer) they take on
a certain size. But when viewing the same view with on eye and the
larger view on the monitor they then actually start to look lifelike.

Anyways, what's the point of all this? Just basically that unless 
the theory, opinion or whatever above is flawed, that viewing slides
has certain limitations in itself and where prints might be slightly
more realistic in this regard. Similiarly to medium format slides.

Gabriel wondering out louDDD. 

 


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