P3D Comments on stereo slide formats

["Dr. George A. Themelis" <DrT-3d@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

DrDave writes:

>That means stereo clubs, SSA folios, PSA stereo 
>exhibitions, and most any stereo slide enthusiast's home.

Unfortunately, as Greg pointed out, many popular stereo viewers
(Realist red and green button, Kodaslide I and II) will not show
the entire width of 7p slides.  This is something to rememember
when you submit slides in the folios of the Stereoscopic Society.
(That's why DrT is around... to enlarge these viewers to 7p!)

>This is NOT to say that a 4p slide can't be better than a 7p. There 
>are other factors such as composition, but if ALL else is equal - the 
>larger the image area the better.

If you work with 35 mm film then the height is restricted to 24 mm.
The difference is only in the width.  So, the blank statement
that a larger image area is better is not accurate because it
involves a change in the propotions.  For example, as you noted, 
a portrait is not better if it is wider.  (this comment assumes 
mounting slides in 41x101 mm mounts).

>I just recently learned that not all TDC projectors can show 7p. 
>Mine does, so I assumed that all could.

DrDave!  You have not been reading photo-3d carefully, have you?!
The TDC 116 carrier will show 7p (up to 40x40 mm).  The TDC 716
will not.  (But DrT can take care of that too!)

George Themelis


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