Nikon AI Micro-NIKKOR 105mm f-4 - Manual (Page 12)

FOCUSING
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Focusing at Predetermined Ratio
Above the distance scale on the focusing ring
are two reproduction ratio scales inscribed in
orange. The inner scale, with figures from 1:10
to 1:2, represents the reproduction ratios ob­
tained when the lens is used alone. The outer
scale figures (i.e., 1:2 to 1:1) represent the
ratios possible when the lens and, PN-1 or
PN-11 ring, are used together. Using either of
these scales, you can photograph at a pre­
determined
ratio without calculating the
distances required. To photograph at a repro­
duction ratio of 1 : 5, for example, just turn
the focusing ring until the number “5” is
aligned with the distance scale index; then
aim at the subject and adjust your position
(close to, or farther away from, the subject)
until the image appears sharp and crisp on
the focusing screen.