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[photo-3d] Re: Zeiss OO Viewer
- From: Abram Klooswyk <abram.klooswyk@xxxxxx>
- Subject: [photo-3d] Re: Zeiss OO Viewer
- Date: Fri, 29 Sep 2000 00:19:15 +0100
Ralph Johnston Sep 28, 2000:
>Can someone please explain the difference
>between "one-ring" and "two-ring".
This is in fact already explained in the e-bay description:
> 35mm slides made with a beamsplitter attachment - that
> which use a single common lens need a O "one ring" type viewer
and:
> 35mm slide stereo pairs made by two separate lenses
> need this OO "two ring" type viewer.
This has all to do with the German tendency to classify and
standardize things, and even terms, and even stereoscopy
terms. The German DIN (Deutsche Industrie Normen) are like
the ASA standards, only more so.
So DIN 4531 and DIN 19040 said that pseudoscopic presentation
("augenwidrig") should be called R-L-Anordnung (Ordnung muss
sein :-)) and get the symbol OO, and the normal or orthoscopic
presentation ("augenrichtig") should get the symbol O (single
ring). This refers to pictures, but then also to the
stereoscopes
they need.
(However, there is no special symbol for rotated pictures from
e.g. TriDelta)
In fact all untransposed pictures from all two lens
stereocameras should be called OO, and need a transposing OO
viewer (or cutting and transposing :-)).
Most "beamsplitters" for single lens cameras do the
transposing for you, so for those pictures you need an O-type
stereoscope, which everyone outside of Germany would call a
_stereoscope_.
Abram Klooswyk
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