Mailinglist Archives:
Infrared
Panorama
Photo-3D
Tech-3D
Sell-3D
MF3D

Notice
This mailinglist archive is frozen since May 2001, i.e. it will stay online but will not be updated.
<-- Date Index --> <-- Thread Index --> [Author Index]

Re: Taylor-Merchant stereoscope lenses


  • From: P3D John Bercovitz <bercov@xxxxxxxxxxx>
  • Subject: Re: Taylor-Merchant stereoscope lenses
  • Date: Tue, 6 Aug 96 14:47:28 PDT

>>>your face.  Noticeable chromatic abberation, too.  So glass
>>>lenses are yet another item on that wish list of mine

>>Are you saying that plastic lenses necessarily have more chromatic
>>aberration than glass lenses?

>Dunno about that...John?...for "glass lenses" please substitute
>"Red Button or equivalent."  :-)

I'll have to look it up (books are at home) but I think ordinary 
optical plastic has a littler more dispersion than ordinary optical 
glass.  At least for lenses of equal power (not equal curvature).  

Since OCC is tonight, I probably won't get a chance to look it up
until tomorrow night.  

The problem is power.  I doubt it would be much of a problem in
a low power lens of reasonably small diameter.  5 diopters is not 
exactly low power but it ain't 10 or 20 diopters where you'd really
see it.  The problem occurs when you look through the edge of a
lens instead of through the center of it.  I think the lens centers
in a stereoscope are about 90 mm apart so you're bound to look through
the edges of the lenses if your eyes aren't also 90 mm apart.  8-)

With an expensive mold, you can mold good plastic lenses but you 
can't mold good glass lenses as far as I know.  So the plastic 
lenses are cheaper in quantity.

John B


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