[photo-3d] Zeiss OO Viewer

[Ralph Johnston/Linda Sherman <copley@xxxxxxxxxxxxxxx>]

Can someone please explain the difference between "one-ring" and
"two-ring".  What ring are they referring to?  Does one type of viewer
reverse the images and the other not?  Would this viewer work with my
Franka beam splitter?  I think I saw a description of this viewer in a book
somewhere, but can't remember where.

Stereo OO Zeiss Ikon Viewer - Beautiful
                                                       Item #452168481

Go to search -by item # to view this e-bay item.

Thanks -Ralph


>Zeiss Ikon OO Stereo Slide Viewer
>
>     A beautifully designed cream and black bakelite internally lighted
stereo slide viewer for stereo images on a 2" x 2" single slide mount.
Operates on two
>     D cell batteries and can accomodate the special halogen bulb for
twice the brightness.
>
>     Designed for OO "two ring" type stereo slides. [35mm slides made with
a beamsplitter attachment - that which use a single common lens (Stereo-Tach,
>     Pentax, Stitz, Contina & Contaflex with Steritars, etc) need a O "one
ring" type viewer]   -  [35mm slide stereo pairs made by two separate lenses (
>     Ultra close up Realist, half frame, Nimslo, Nishika, Image Tech,
Contax with Stereotars, etc.) need this OO "two ring" type viewer].
>
>     Viewer is in like new condition, with photo copy of instructions in
English.
>
*****************************************************************
*   Linda Sherman/Ralph Johnston
*   WEB PAGES http://www.ultranet.com/~copley/
*      1) Photo Historical Society of New England
*      2) Stereo New England
*      3) Auburndale Community Association
*   617-527-7562
*****************************************************************