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

["Dr. George A. Themelis" <drt-3d@xxxxxxx>]

> Please someone tell me if the 1/30 rule is still appropriate when 
> using 35mm lenses instead or normal 50mm or 55mm. 

YES!!!  Actually, this formula coincides with the more
complex "1.2mm maximum on-film deviation (MOF) " if the
lens is 35mm and the far object is at infinity.

I like the way David Lee deals with MOF.  His practical
treatment is somewhere in Steve Berezin's site and has been
presented in the Stereogram 5.6 Tutorial (Single Camera
Stereos, Part II - deals with "how much to shift")

David recommends:

- Establish the equivalent of 1/30 factor that suits your taste
and your photography.  Measure/estimate the distance of
the nearest object and divide by 30 (or your factor)

- If the furthest object is distinctly closer than infinity
then add 50% separation.

- When using wide angle lenses double the separation.
When using long lenses cut the separation in half.  Normal
is 35mm or 50mm for 35mm film. Wide lens would be 28mm
or 24mm.  Long lens would be 100 or 135mm.

Note:  One of my 4 workshops in NSA Buffalo would be
"Stereo Photography with a Single (2D) camera" (complete
list of all 4 workshops will follow tonight.)  I will go through
a lot of details of single-camera shooting, all nicely
illustrated with stereo pairs shown in projection.  How much
to shift is one of the most frequently asked questions so
you will hear quite a bit about it (from the point of view
of the practical stereo photographer, NOT the mathematician!)

George Themelis


 

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