Nikon F50D Instruction Manual - Page 53

Guide for flash shooting distance range, SIMPLE mode at ISO 100, Using guide number to estimate

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Guide for flash shooting distance range in SIMPLE mode (at ISO 100) For outdoor subjects on sunny day 0.6 -1.6m For outdoor subjects on cloudy day or in shadows 0.7 - 2.3m For indoor subjects 0.7 - 4.6 m Use the listed range only as a guide for a lens having maximum aperture of f12. 8 or faster. With slower lenses, the maximum shooting distance will be reduced. Using guide number to estimate the maximum shooting distance You can also estimate the maximum shooting distance by guide number of built-in flash. Guide number Lens full aperture =Maximum shooting distance Guide number for each ISO setting (m) ISO film speed 25 50 100 200 400 800 6.5 9.2 13 18.4 26 36.8 • The wider the aperture (the smaller the f-number) you select, the farther the maximum shooting distance, whereas the smaller the aperture (the larger the f-number), the shorter the maximum shooting distance. • With a slower shutter speed, a smaller aperture is automatically selected, resulting in a shorter shooting distance range. 53

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Guide for flash shooting distance range
in
SIMPLE mode (at ISO 100)
For outdoor subjects
on
sunny day
For outdoor subjects
on
cloudy day or
in
shadows
For indoor subjects
0.6
-1.6m
0.7 - 2.3m
0.7 -
4.6 m
Use the listed range only
as
a
guide for
a
lens
having maximum aperture
of
f12.
8
or
faster. With
slower lenses, the maximum shooting distance will
be reduced.
•
The
wider
the
aperture
(the
smaller
the
f-number)
you
select,
the
farther
the
maximum
shooting
distance,
whereas
the
smaller
the
aperture
(the
larger
the
f-number),
the
shorter
the
maximum
shooting
distance.
Using guide number to estimate the
maximum shooting distance
You can also estimate the maximum shooting distance
by
guide number
of
built-in flash.
Guide number
L
full
=
Maximum shooting distance
ens
aperture
Guide
number
for
each
ISO
setting
(m)
ISO
film speed
25
50
100
200
400
800
6.5
9.2
13
18.4
26
36.8
•
With
a
slower
shutter
speed,
a
smaller
aperture
is
automatically
selected,
resulting
in
a
shorter
shooting
distance
range.
53