P3D Re: PHOTO-3D digest 3255

[Patrick Boeckstijns <pboeckst@xxxxxxxxx>]

>Date: Thu, 18 Mar 1999 22:47:23 +0100
>From: abram klooswyk <abram.klooswyk@xxxxxx>
>To: photo-3d@xxxxxxxxxxxxxxxxx
>Subject: P3D Re: Stereo Graphic's "Depth Master", Re Differential Focus
>Message-ID: <36F1746B.4676@xxxxxx>
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>Different focusing of lenses with equal focal length 
>gives different image size on film.
>
>As Bob Aldridge has indicated, the Wray Stereo Graphic trick is 
>to use lenses of (slightly) _unequal_ focal length and position 
>them at _equal_ distances from the film, so you get equal image 
>size, but unequal focused distance.
>
>A part of the depth of field of both lenses will overlap,
>but at the far as well as at the near end of the overlap 
>zone one of the lenses will give some blur.
>
>Obviously you can get away with this, but it has been 
>documented that introducing blur in one eye deteriorates
>stereoscopic vision. I don't have the data on hand, it
>might be true only for considerable blur, I will try to
>find data if it interests anyone.
>
>Abram Klooswyk

WAIT WAIT WAIT !
All these years i've been breaking my head over how many shims there were
under each lens barrel in order get different focus. (There are six in
total which I divided up into two under one barrel and four under the
other/trial and error really). 
I'm I right to understand now the difference in focus is "made" in the
lensbarrel itself and there probably were an equal number of shims under
each barrel ?

Regards,

P. BOECKSTIJNS
VRIJE UNIVERSITEIT BRUSSEL (VUB)
Pleinlaan 2

1050  BRUSSEL

Tel: 32 2 629 2309
Fax: 32 2 629 2362
 


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