Reproduction Ratio
The reproduction ratio is the numerical expres
sion of the relationship between the image size
(to be recorded on the film) and the actual size
of the subject. For example, if the image on
the focusing screen is one-fifth the actual size
of the subject, the reproduction ratio is said to
be 1:5, and is indicated on the reproduction
ratio scale of the Micro-Nikkor 105mm f/4 by
the number “5’I
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