Re: [photo-3d] Re: Camera separation in stereo photography

["don lopp" <dlopp@xxxxxxxxxxxxxxx>]

As reguards to adecent stereo base, yesterday I shot a bunch of test shots
with my Rolleidoscope  [ 75 mm lenses  , 65mm base shooting object which
included infinity and anobject at 7 ft. and at 15 ft.. The 7 ft. shots gave
a deviation of 2 or more mm. of deviation and were impossible for me or my
friends to view with any viewer reguardless of focal length ! It causes me
to believe that whoever put together the formulas referred to recently never
bothered to test them out , especially as reguards  to 2.5 mm using MF .
Whoever put tis miss information out shoul offer their appologies. It is no
wonder to me that I  reffered to the blind leading the blind ,that is the
way it appears to me . I will send some samples toGreg E or insert them into
the next folio.  I have never had much fait in theoretical photography
.spent one week the imfamous inventor of the zone system - what a joke-he
bracketed most allof the shots I saw him take-he took more shots in a week
than I did in a year or close to it Its getting past my bedtime .  Don.
----- Original Message -----
From: "Abram Klooswyk" <abram.klooswyk@xxxxxx>
To: "PHOTO-3D" <photo-3d@xxxxxxxxxxx>
Sent: Thursday, June 29, 2000 2:36 PM
Subject: [photo-3d] Re: Camera separation in stereo photography


> Sergio Baldissara (29 Jun 2000):
> >Fusion capacity physiologically varies between individuals:
> >some skilled stereo watchers are even able to freeview
> >stereocards in parallel format.
>
> I don't believe the ability to freeview is the same as, or
> even related to, the capacity to view large convergence
> differences. These are essentially different skills.
>
> don lopp (28 Jun 2000):
> >I think  the deviation numbers given are erroneous or being
> >measured in a strange way  ?
>
> The strict definition of deviation is something like:
> The Deviation of a pair of homologues on a stereo picture is
> the difference between the infinity separation on the stereo
> picture and the separation of that pair of homologues.
>
> In looser usage, for the infinity separation (which is often
> not measurable) the far point separation can be substituted.
>
> In the stereo base discussions often the deviation of the mask
> aperture is used. Its separation is easily measured on the
> mount, and it is mostly known already. Then only the
> separation of infinity homologues or of far points have to be
> measured to compute the mask deviation on the mounted slide
> (or card). This is often the largest deviation of the slide,
> unless something gets "through the window.
>
> Hardly any errors can occur in my opinion (if we stick to the
> right terms :-)).
>
> Abram Klooswyk
>
> BTW: Can replies to posts please quote only the necessary, not
> whole messages?
>
>
>
>