P3D Re: Andrea's Macro Conclusions

[Tom Deering <tmd@xxxxxxxxxxx>]

>I contend that science is full of hypothesis and observation and
>conclusion, and there must be macro-math that works.

There is indeed macro math that works.

The exact formula to calculate camera separation can be found in the
photo-3d archives.  There are also spreadsheets which utilize this formula.
You must plug in six or seven measurements, but it works for all
situations, including macros.

The 1/30 rule is a generalization based on several assumptions.   When one
of the assumptions is wrong, the 1/30 rule doesn't work.  One assumption is
that the farthest point in your photo is at infinity.  That assumption
works fine for most outdoors shots, but obviously not for macros.

The 1/30 rule is a rule-of-thumb for ordinary situations.  For less common
situations like macros, you need to guess, waste film, or do the complex
math.

Cheers,

Tom



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