P3D Re: Viewing with vs. without lenses

[Bruce Springsteen <bsspringsteen@xxxxxxxxx>]

Hey, have I told you lately that I love to free-view? ;-)

Greg the Human Stereoscope astounds me with his ability to free-view at
eight inches - call Ripley, phone Barnum & Bailey!  That gives him
magnification nearly as good as the average Holmes viewer, and no detail
will escape his discerning myopia.  But he suggests accomodation is the
accomplishment of note.  What astounds me is his divergence on a par with
Jean Paul Sartre, late comic Marty Feldman, and perhaps Tony Alderson
(though TA may really mean he's cross-viewing, great for pseudo-stereo
cards).  I have a largish 70 mm interocular, and while I too can
accommodate at seven or eight inches, I have no chance of fusing infinity
(far point) separations like my Holmes scope can, from 80 to 85 mm on
average in standard views!  To free-view that, you have to diverge your
eyes anywhere from 2 to 4 degrees, by my ciphering.  I can't fuse when I
have to diverge more than about one degree - at the 18 to 20 inch distance
of mere mortal freeviewing folk.  At that point we're back to
de-magnification, and my basic generalization holds firm, sad to say. 
More power to you visual gymnasts, however many of you there may be!  We
in the majority salute you!

Bruce (Oh why, oh why, am I a myope?) Springsteen




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