Nikon SB 20 Instruction Manual page 24

Exposure compensation in TTL mode
With a dark subject (with low reflectivity) or one that is
light in tone (having high reflectivity), over- or under-
exposure may occur. To prevent this, compensate
exposure by rotating camera 's exposure compensation
dial. With the FG, push the exposure compensation
button. (For details, see camera instruction manual.)
The shooting distance range for TTL automatic flash
operation varies with the amount of exposure compen-
sation . For compensated distance range, see table at
right , then reset film speed setting on the back of
88-20.
For example, with 180 100 film and camera 's exposure
compensation dial set at +2, read 25 on the table and
reset the 88-20'S film speed index to 25.
With the zoom set ring at N and an aperture of f /4, the
flash shooting distance range-which is 1 m to 7.5 m at
22
180 100-shifts to 0.6m to 3.7m at 18025.
The Nikon F-401/ N4004 has no exposure compensa-
tion dial , and compensates exposure with automatic
balanced fill-flash .
~.
sation value +2
+1
0
-1 -2
Film speed in use
25
/ /
25 50 100
50
/
25 50 100 200
100 25 50 100 200 400
200
50
100 200 400 800'
400
100
200 400 800 '
/ '
800 ' /1000 ' 200
400
800 '
/ /
'For Nlkon F-5011N2020 and F-301IN2000 only.
1:2::1:
Not possible; make the necessary compensation in
the non- TTL automatic mode (see the following) or
shoot on manual.