3D standards

[P3D <klein@xxxxxxxxxxxxxxxxx>]

John Bercovitz talked me into digging through my stuff about standards. 
Fortunately, everything is organized neatly.

There are quite a number of standards about 3D - however, most of them are=
 
German since the Germans seem to want to standardize just about 
everything:

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DIN 4531: Stereoskopie (Raumbildwesen)
(Stereoscopic (3 D) photography; sizes of mounted pictures)

 They list 4 different possibilities for the 41 x 101 mm format slides:

        * 24 x 30 mm (nominal), 23 x 28 mm (max. effective size), horizontal
        * 24 x 23 mm (nominal), 23 x 21 mm (max. effective size), vertical
        * 18 x 24 mm (nominal), 16 x 23 mm (max. effective size), horizontal
        * 24 x 18 mm (nominal), 23 x 16 mm (max. effective size), vertical

All the formats have a image windows 62 apart (center to center).

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DIN 6170: Anaglyphenverfahren in der Stereoskopie
(Stereoscopy with anaglyphs)

four different types of anaglyphs are being listed:

        * Positive anaglyph
        * Negative anaglyph
        * Mixed anaglyph
        * single-sided anaglyph

It is not standardized if the red filter of a pair of stereo glasses 
has to be over the left eye, although all the descriptions are based upon 
it.

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DIN 19040 - Teil 8: Begriffe der Photographie: Allgemeine technische 
Begriffe f=FCr Stereoskopie (Raumbildwesen)
(Nomenclature of photography; technical terms in general use, stereoscopy 
(3-D), principles)

Re. anaglyph glasses, it mentions:

        "... it is customary to assign to assign the long wavelengths of the 
visible spectrum to the left eye and the short wavelength to the right 
eye, i.e. left =3D red (orange), right =3D blue (green).

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ASA PH3.11-1953: Americal Standard Dimensions for Stereo Still pictures on=
 
35-Millimeter Film, 5-Perforation format

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ISO 515: Photography - Stereo systems using 35 mm objectives on 35 mm 
film, five-perforation format - Specifications

... not much to add here. I've the First Edition - 1973-09-01 -- any other=
 
editions? This is basically the ASA PH3.11-1953, but also lists the 
dimensions in mm.

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That's the end of the "official" part - but there's more. I have a copy of=
 
a notebook that belonged to Karl Kurz, one of the designers of the 
View-Master Personal and TDC Vivid stereo cameras. He seems to have been 
actively involved in the development of the ASA standard, since there is a=
 
typed copy of a "Proposed American Standard for Stereo Still Pictures on 
35 mm film (5 perforation format), which has a few handwritten notes on it=
 
("Use for TDC" etc.) It's dated 7 May 1952.

Then I have two drawings:

        * Suggested 35mm Stereo Format - 5 Perforation
                It's slightly different from the final standard, but only slightly.

        * Suggested 35mm Stereo Format - 6 2/3 Perforation
                
The latter suggests an image width of 1.246" (6 2/3 Perfs.), with an 
effective width of the image of 1.181", +/- 0.004", and a height of 
0.945", +/- 0.004". The centers of the images on the film are 2.493", +/- 
0.004" apart.

The mount itself is 4", -0.16", wide and 1.625", -0.16" high. The Images 
(apertures) are 1.125", -0.002" wide and 0.930", +/- 0.004" high. The 
centers of the apertures are 2.436, +/- 0.02" apart, with 2.450, +/- 
0.004" between the centers of the transparencies. The corners have 1/32 
radius.

If there's enough interest, I could be convinced to scan Kurz's documents 
(3 pages) and do an ftp-upload to the photo-3d directory.

Regards,

Alexander Klein
3D-Magazin, Editor
http://www.stereoscopy.com


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