Nikon SB 20 User Manual
Page 85
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Usable film speed
range in TTL mode
Usable aperture
range in TTL mode
A mode
Usable apertures in
A mode
ISO 25 to 1000 with Nikon
F-501/N2020 and F-301/
N2000 or ISO 25 to 400 with
Nikon F-401/N4004, FA, FE2,
and FG
f/2tof/22 (at ISO 100)
For non-TTL auto flash oper
ation; light is measured via
light sensor in front of fhe
flash unit
f/2, f/2.8, f/4, f/5.6 and f/8
(at ISO 100)
Shooting distance range in A mode
Unit: m (ft.)
Aperture
Shooting distance range at ISO
too
and zoom set ring set at
N
f/2
1.9-15(6.2-49)
f/2.8
1.3-10(4.3-33)
f/4
1.0-7.5(3.3-25)
f/5.6
0.7-5.3(2.3-17)
f/8
0.6-3.7 (2.0-12)
M mode
For manual flash operation;
amount of light output can be
varied in five sfeps