Maybe it was my imagination, but I thought I read, from Bill G., that we
can see ortho stereo because of the large DoF resulting from the short
fl of our eyes. I am not aware that I can focus on more than one
separate object at a time, regardless as to whether the objects are in
my field of potential focus or not. A 3d photograph shows the position
of everything in the photograph, at the instance that the picture was
take≥ , whether in focus or slightly out of focus. As far as everything
being in focus from 10 feet out, I do not think that this is factually
true. When in a room, and I focus on something at 10 feet, it appears to
me that things 15 or more feet away require a different focus, and a
different aiming point, than when I focus on an object at 10 feet. A
filmed 3d image provides 3d cues not always visible to just any casual
onlooker.

Details do matter.

DON

On 10/13/2011 8:10 PM, Don Lopp wrote:

>
> Maybe it was my imagination, but I thought I read, from Bill G., that we
> can see ortho stereo because of the large DoF resulting from the short
> fl of our eyes.
>

Yes, this was CLEARLY your imagination at work here.... you
are correct, I NEVER stated you can see 3d due to depth of field..... glad you are
starting to find the source of your errors...

> me that things 15 or more feet away require a different focus, and a
> different aiming point, than when I focus on an object at 10 feet. A
> filmed 3d image provides 3d cues not always visible to just any casual
> onlooker.
>
> Details do matter.
>

Yes, Details do matter Don, that is what I often
preach.... and in this case, you need to know the diameter of the iris, determined by the
amount of light hitting the retina, to determine how much DOF the eye has.... you also
need to know the refractive errors of the eye....so your little experiment is the result
of your eyes refractive errors, DOF, etc, another person would be different, so it would
be senseless to draw conclusions from your ONE experiment.... your post expressed the
opposite, but we understand you know better Don, specially after the years of testing in
the 1950's with the famed Univ. Professor.


There is another sad fact about vision Don.... that is,
as we age, our eyes become severely compromised... not just the obvious macular
degeneration and cataracts, but we loose our ability to accommodate, AND more importantly,
we loose our iris dilation range, vs. our younger years.... in 3d viewing, this means,
less light to the retina, as unless someone is using the sun as a light source, or a
several thousand dollar lighting system, the limitations of the iris opening becomes the
bottleneck for seeing resolution. Here is a table showing iris dilation range vs. age.....


Age ... Day light pupil... Night light pupil (mm)


20...(4.7)....(8.0)
30...(4.3)....(7.0)
40...(3.9)....(6.0)
50...(3.5)....(5.0)
60...(3.1)....(4.1)
70...(2.7)....(3.2)
80...(2.3)....(2.5)


So this is another reason Don, you can't expect what
you see, to be Universal vs. what others see. Unfortunately, almost every hobby that
relies on human vision as its main ingredient for success, is best suited for the younger
crowd. This doesn't mean us older folk can't appreciate visual stimuli, however, in
some situations, we often can not appreciate it as much as the younger folks. This is
part of the reason you see some people fall in love with 3d film viewing, and others, have
zero interest in it.

Since you refuse to read any reference material on these
subjects, I suggest you read my review on Amazon on the 10x42L binoculars, its the top
rated review (and won me lots of free stuff on Amazon), although I am sure you will find
nothing but fault with it....it will help you fill "some" of the holes in your knowledge
base which is why some of these threads are never-ending.....

Best of Luck Don
Bill

>
> DON
>
>