P3D Re: VM and Kids

[jacob@xxxxxxxxxxxxxx (Gabriel Jacob)]

Bruce Springsteen writes:
>If I read my Ferwerda right, 2 simple convex lenses of a given size,
>set in a stereoscope with their principal axes (centers) at an
>interocular separation matching the infinity separation of the
>stereoview, will allow an unimpeded view of left and right frames for
>persons whose eyes are within a *range* of interpupillary separations.
>What is this range?

The range depends on the diameter of the lenses.

>One last thing.  I believe adding an interocular adjustment to VM,
>while retaining the same infinity spacing on the views, would make
>the wee ones diverge - and that hurts, mommy!

True. As George mentions, theoretically it should be fixed but most
users prefer (myself included) adjustable interoculars. Another
option (expensive) is to use prisms or mirrors.

Last years talking VM has a slightly reduced lens spacing (~62mm)
but might be immaterial since the quality is awful.

Gabriel


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