Nikon SB 20 Instruction Manual page 29

Autofocus speedlight
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Usable apertures/shooting distance range in
A mode
Unit
:
m (It)
ISO
film speed
Shooting distance
range
1600 800 400
200
100 50 25
Zoom
set Zoom
set
Zoom
set
atW
at
N
afT
8
5.6
4
2.8
2
1.4
1.4-
11
1.9
- 15
2.3-
18
-
(4.6-36)
(6.2-
49)
(7.5-59)
tl
8
5.6
4
2.8
2
1.4
1.0-7.8
1.3-10
1.6-12
(3.3-26) (4.3 -33) (5.2-39)
D.
0.7
-
5.5
1-7.5
1.2-9
0
16
11
8
5.6
4
2.8
2
~
(2 .3-18) (3 .3
-
25) (3.9-30)
22
16
11
8
5.6
4
2.8
0.6-3.9
0.7
-
5.3
0.8-6.3
(20-13)
(2.3-17) (2.6
-21)
32
22
16
11
8
5.6
4
0.6-2.7
0.6
-3.7
0.6-4.5
(2.0-89) (2.0- 12)
(2.0-15)
Exposure compensation in A mode
With a
dark
background
(one with low reflectivity) or
one
that
is light
in tone
(having
high
reflectivity), over-
or underexposure
may
occur.
To
prevent
this,
compen-
sate
exposure by
stopping
down or opening aperture.
With a
dark
background,
stop
down the
aperture
1/2
to
one full f/stop
;
when the
background
is light in
tone,
open the aperture
112
to
one
full
f/stop.
With the
Nikon F-401
/
N4004,
set
aperture
using the
camera's
aperture
dial.
27

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