Nikon F25B Photomatic Instruction Manual page 39

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Maximum Aperture Indicator
As the lens'
aperture
ring is turned
to
the maximum
aperture
position
at
the
completion of
lens/finder
cou-
pling
and
indexing,
the finder
displays
the
lens' maximum
aperture via
the indicator (see
figure
below).
For ex-
ample, a
lens with
a
maximum
aperture of f/2.8
will
cause "2.8"
to
appear
in the
finder's
maximum
aperture
indicator
when properly
coupled.
The
scale
is provided
with numbers (and dots
for
intermediate
settings) of
from "1.2"
to
"5.6" as
depicted.
Maximum Aperture Scale
5·9_
4.5
4
e-
3.5
[2:6]-2.5
2
1.4
1.2
39

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