[photo-3d] Re: Newbie question-near point distance

[abram.klooswyk@xxxxxx]

To Clement's short question 25 Apr 2001:
>Please someone tell me if the 1/30 rule is still appropriate 
>when using 35mm lenses instead or normal 50mm or 55mm. If 
>not, what would it be? 
several long answers were given. 

The first answer obviously should be: 
Take care! Search the archives for "1/30" and shiver...

George Themelis 26 Apr 2001:
>BTW, there is school of thought that believes that 1/30
>is the answer to this question, *independent* of the
>focal length!  According to this school, the "angle of
>convergence" and not the on-film-deviation should
>be constant.  Go figure! :)

With a little rephrasing I could belong to that school.
The 1/30 rule is based on the belief that in VIEWING
stereopictures the _difference_ in the convergence
of the eyes between looking at near points and at far
points of the illusionary scene should be restricted. 
Say to two meter near and infinity far. Two meter is about 
30 times the average interpupillary distance of 65 mm. 

So in fact the one-in-thirty rule is not only independent of 
camera focal length, but even independent of photography, it 
would apply to anaglyph cartoon viewing too.

The complications and the math come when you go back to lenses 
and photography, but it helps to keep the goal in mind.

Abram Klooswyk 


 

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