Nikon SB-28 - Manual (Page 91)

91
Automatic Insulated Gate Bipolar Transistor (IGBT) and
series circuitry.
• See page 51 for details on guide numbers in FP High-
Speed Sync Flash and see also page 30 for details on
guide numbers in 1/300 TTL High-Speed Sync Flash.
(Variable in 6 steps, plus 2-steps with built-in wide flash
adapter)
Specifications
Electronic
construction
Guide number
Angle of
coverage
Flash
output
level
1/1 (full)
1/2
1/4
1/8
1/16
Zoom-head position
24mm 28mm 35mm 50mm 70mm 85mm
30/98 32/105 36/118 42/138 48/157 50/164
21/69 22.5/74 25.5/84 30/98 34/112 36/118
15/49 16/53 18/59 21/69 24/79 25/82
10.5/35 11.3/37 12.7/42 15/49 17/56 18/59
7.5/25
20mm
20/66
14/46
10/33
7/23
5/16
18mm
18/59
12.7/42
9/30
6.4/21
4.5/15 8/26 9/30 10.5/35 12/39 12.7/42
1/32
1/64
5.3/17 3.5/11 3.2/10 5.7/19 6.4/21 7.5/25 8.5/28 9/30
3.8/13 2.5/8 2.3/8 4/13 4.5/15 5.3/17 6.0/20 6.3/21
(ISO 100, m/ft)
Zoom-head position
18mm (with built-in
wide flash adapter in
place)
Angle of coverage
Horizontal
90
°
Vertical
102
°
20mm (with built-in
wide flash adapter
in place) 85
°
98
°
24mm 60
°
78
°
28mm 53
° 70
°
35mm 45
°
60
°
50mm 34
°
46
°
70mm 26
°
36
°
85mm 23
°
31
°
Flash head in horizontal/front position