P3D Re: Take the "Stereo Format" quiz

[klein@xxxxxxxxxxxxxxxxx]

On  9 Feb 98 at 12:48, Dr. George A. Themelis wrote:

> One of the most important and rather complicated (IMO) issues in stereo
> photography is the issue of stereo format.  I am working on an article
> for the next "Stereogram" and would like some input from the list.  But
> let's start with a simple quiz that will show some of the complications
> in trying to define what a stereo format is:
> 
> If I claim that I work in the "Realist Format" which of the following
> statements are True?  ("True" does not mean that the statement defines
> the format, just that if I use this format, then the statement must be
> true)
> 
> A. I use a Realist camera
No, not necessarily. But the camera system coined the expression.

> B. I use a stereo camera that follows the C. Progression (5 perforation 
>    interlocking images)
Yes, this applies to take images in the Realist Format

> C. My film chips are 5 perforations wide
Yes, see B

> D. I use slide (transparency) film
No. Realist format cameras can also use other film

> E. I use 35 mm film
No. There are cameras using 120 roll film such as the Stereo Rocca (Japan) 
or ISO Duplex (Italy) taking 3D-pictures each about 24 x 23 mm big.

> F. My chips are mounted in mounts with appr. dimensions 101 x 41 mm. G. E
> but also the windows are appr. 23 x 21 mm wide

The "Realist Format Mount" is a bit tricky. IMHO it can refer to outside 
dimensions (41 x 101 mm), not mattering how big the image chips are - or 
also to the "window frame" size (approc. 24 x 23 mm).

**************************

> If I claim that I work with "Prints", which of the following statements
> are True?
> 
> A. I use negative film
No way. You can also shoot slide film and have prints made.

> B. My final images are on print paper
Not necessarily. They could also be on other type of paper as used by 
high-quality computer printers - or printed in a magazine.

> C. My final image must be viewed with reflected light
Not necessarily - but it usually applies. But (for examples) the "tissue" 
views made in the last century could be viewed BOTH, with reflected or 
transparent light.

> D. My R and L images are side by side
No way! Over-under works fine - and you can also superimpose them 
(anaglyphs)

> E. The spacing of infinity in R and L images must be less than 2.5" 
>    (appr. spacing of the eyes)
No way! No limitation here.

> F. A Holmes' stereoscope could be used to view the stereo image.
No way! Every stereo viewer or free-viewing works with prints.

**********************

> If I claim to be working in the "View Master" format, which of the 
> following statements are True?
> 
> A. I use slide (transparency) film
Yes, usually. Who would want to load a V-M camera with print film? But who 
knows? It's nothing illegal...

> B. My images have appr. size of 12 x 13 mm
Yes, when you are talking about the size of the original image on the 
film.

> C. My images are mounted in pairs of 7 in this round disc patented by VM 
>    in the 30s
No. Although most people do it that way, you could also use the film-chips 
to build your own viewer etc...

> D. A View-Master Viewer can be used to view the images and a VM 
>    projector can be used to project them
Yes, but only when you use slide-film and mount in reels.

> E. The pictures were taken with a VM Personal camera
No. You forget the View Master Color and Meopta (various models) cameras.

> F. The pictures were taken with any stereo camera that was designed for 
>    the VM format (VM Personal, Mikroma, etc.)
Not necessarily. I've seen people who use a Stereo Realist and cut out 
parts of an image which is then mounted into a reel (thus becoming part of 
the View-Master-System).

> Good luck!  Will give my answers (with justification) later...
> 
> -- George Themelis

alex

Alexander Klein
3D-Magazin, Editor (http://www.stereoscopy.com/3d-magazin)
Webmaster: http://www.stereoscopy.com


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