P3D 59, 65, 70, 75 mm???

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

Here is the important question:  How much is the decision of whether 
to go with 59 mm (RBT S1), 65 mm (some RBTs, and 7p "European" 
stereo), 70 mm (Realist stereo) or 75 mm (some RBTs) affected by 
one's interocular?  So does the fact that Greg has 70 mm interocular 
mean that he will be happier with the 70 mm cameras?  Will a person 
with 60 mm interocular be more happy with the S1?
 
How about the matching of the focal lengths of taking and viewing?
We can take it for granted that the pictures taken with the usual 35 
mm lenses in the stereo camera will be viewed with 45 to 50 mm 
lenses in the viewer.  This introduces some stretch that might be 
noticeable in portraits and other sensitive situations.  

In these sensitive situations, less is better.  The 59 mm of the S1 
has an advantage over the Realist or other wider interaxial spacings.  
And that's one reason I selected the S1 from the other RBT cameras.
After using the S1 for a few months, the other day I looked at a
portrait of my son, taken with the Realist and, oh my, I could see 
stretch in the viewer!  (Projection of course makes things worse).

The bottom line is that the RBT S1's narrower interaxial seems to
me to result in more natural-looking close up pictures of people
because the narrower interaxial "cancels out" the longer viewing 
focal length.  Of course, that's just my opinion.  Others have 
expressed a preference for "maximum" depth and might be unhappy 
with a stereo camera with narrow interaxial.

George Themelis



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End of PHOTO-3D Digest 3221
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