Re: Interocular&focus necessary?

[P3D John Bercovitz <bercov@xxxxxxxxxxx>]

Re: Interocular&focus necessary?

If you're young and have good (even if as-corrected) vision you won't 
need focus.  If you're older, you'll need focus to make the system 
agree with your eyes.  Interocular is one of those things you'd rather 
not have but necessity may dictate it.  If the viewer lenses aren't 
large enough in diameter and so with your eye spacing you can't see 
the images completely, then you have to have interocular adjustment to 
use that viewer.  Best is probably to have your eyes surgically relocated 
to 65 mm centers.  The problem with interocular adjustment is that if 
your eyes are spaced closer together than average, you'll be looking 
wall-eyed (diverging) when you view and that is uncomfortable for some 
people.  Also, converging or diverging to objects at infinity has some 
weak effect on size perception (unless the vergence error is very large 
and then it can become a real problem).  Likely you won't run into
trouble with vergence unless the viewing lenses are very short and your
eyes' spacing is a long way from 65 mm.

As to choosing True-Vue, I've heard that they were done on film which
has poor archival properties and so they are pretty faded.  This is only
hearsay but you might check it out.

John B


------------------------------