Am 08.04.2014 20:32, schrieb Torsten Bronger:

> I think this supports my view that Hugin's focal length, multiplied
> by (1-a-b-c), results in the real one.

Why do you want to know the focal length that precise? Lenses are
allowed to differ up to +/- 5% from the advertised focal length. Many
lenses change focal length during focusing. Most modern 100mm 1:1 macro
lenses f.e. have a near limit of 30cm, which means the focal length is
only 75mm at near limit. Who cares?

-- 
Erik Krause
http://www.erik-krause.de

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