Re:SIRDS and Interpupillary Distance

[P3D Dr. George A. Themelis <fj834@xxxxxxxxxxxxxxxxxxxxx>]

Reply to message from normgold@xxxxxxxxxx of Tue, 19 Aug
>
>Interpupillary distance is about 60-70 mm for 90% of the adult
>population.  Most SIRDS at their original size have a 'pitch' of about
>30-40 mm precisely so that the eyes, even when close set, have to
>converge slightly. So, the 'Asian Effect' is highly unlikely. 

The person who mentioned the "Asian Effect" was referring to regular
Realist format viewers and not SIRDS.  My comments regarding smaller
interpupillary distance and difficutly in seeing stere were made
for using these viewers.

>2. Folks who have never been able to see the image don't know what to
>look for. The proper convergence is probably just passed right over. 

Or it is never achieved.  

>3. Tilt is intolerable- just a 1 or 2  degrees and it becomes either
>painful or impossible to converge properly. Viewer should take measures
>to make sure both head and picture are horizontal.

1 or 2 degrees is a very small angle and no matter how careful a person
is, such deviation is very possible.  I just tried and was able to 
view SIRDS at 45 degrees angle.  I don't see why this is painful or
impossible.  

-- George Themelis


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