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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