Re: Questions on Handmade Stereopticon

[P3D Jim Crowell <crowell@xxxxxxxxxxxxxxxxx>]

At 4:42 PM 8/3/96, P3D Bob Wier wrote:
>
>(This is kind of neat because not only does function as a viewer, but
>it also has my particular correction built in as well - If you wanted
>a "general" viewer though, I presume you wouldn't include the astig
>corrction and so forth - maybe Jim C. could comment on this).
>

Sure, it depends on whom you're building the viewer
for--yourself, or everyone else.  :-)
A mild correction for farsightedness might not be too bad; other
people could just slide the stage in closer & get a bigger field
of view.  Anything else would probably be a no-no.

I've been kicking myself ever since I bought my last pair of
glasses;  I forgot to check the single, most important criterion
for the frames--namely, that they fit under the hood of my
stereoscope  (DOH!).

At 10:20 AM 8/4/96, P3D Alan Lewis wrote:
>
>Source for purchase: Taylor-Merchant (phone 800-223-6694) sells
>a molded plastic version
>that is easy to mount in a routed square pocket in wood.  It is
>around $8 per pair.
>These lenses meet the above spec. but are of molded plastic so
>they are not as good as
>glass lenses, but are plenty good enough for a homemade viewer.
>

What he said.  The price is right, but the loss of sharpness is
noticeable, particularly if (as I now have to do, see above) you
take off your glasses & slide the stage in to about an inch from
your face.  Noticeable chromatic abberation, too.  So glass
lenses are yet another item on that wish list of mine (as my
grandmother used to say, "Want in one hand & spit in the other &
see which one gets full first.").

-Jim C.


------------------------------------------------
Jim Crowell
School of Optometry
360 Minor Hall
University of California
Berkeley, CA 94720-2020
(510) 642-7679
jim@xxxxxxxxxxxxxxxxx
http://john.berkeley.edu/IndividualPages/jim.html



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