Re: Stereogram Billboards?

[P3D Gregory J. Wageman <gjw@xxxxxxxxxx>]

Chuck Field writes:

>  I can free view antique stereo views fine, though it still takes me up to 
>a minute to get them in focus.   BTW... when I free view stereo views, am I 
>doing it cross-eyed or parallel viewing?

You could conceivably be doing it either way.  If the stereo effect seems
to be reversed (distant objects seem to be in front of near objects), then
you're crossing your eyes.  If (most) of them seem to have proper stereo
effect, then you're parallel viewing.  (I say "most" because I have seen
some pseudo'd stereo views.)  The "correct" way is to parallel view.

I can do either.  However, I'm very nearsighted, and I find that I must
look over the top of my glasses or remove them, to parallel view stereo
views held close to my face; otherwise the image is out-of-focus.  On the
other hand, when viewing cross-eyed, I must keep my glasses on and get
fairly close, in order to keep the image in focus.  I find parallel
viewing to be less of a strain generally, but repeatedly removing and
replacing my eyeglasses gets rough on the ears.

For some reason, I found that I was only able to fuse the images in the
Harold Lloyd book if the book was at arm's length or greater.  I don't
have this problem with antique stereo views.  I thought these used
approximately the same separation and image size; why the difference?

	-Greg


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