Nikon SB-25, Инструкция по эксплуатации

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Chapter
5
About Batteries
New batteries
Purchase the newest (freshest) batteries possible.
Temperature
Battery life ratings are based on operation at 20˚C (68˚F).
Especially at a lower temperature, battery life is shortened.
Keep spare batteries and if possible, use NiCd batteries.
Continuous use
Batteries are drained more quickly by continuous use than
by intermittent use.
Storage
Store batteries in a cool, dry place, below 20˚C (68˚F).
Battery brand
Do not mix battery brands or models, or new and old batter-
ies.
Disposal
Do not dispose of batteries by burning, and never disas-
semble batteries.
NiCd batteries
Compared with regular batteries, NiCd batteries offer a
faster recycling time and greater efficiency at low tempera-
tures.
Before charging NiCd batteries, thoroughly read the
instructions for the batteries and battery charger.
Batteries with a “+” terminal that exceeds 6mm (0.23”) in
diameter cannot be used.
DC Units SD-8/SD-7
Nikon DC Unit SD-8 or SD-7 can be used as an optional
external power source to enhance flash capacity and pro-
vide faster recycling time.
To use the DC Unit, connect its power cord SC-16 to the
SB-25’s external power terminal. Even when powered with
the DC Unit, the SB-25 still requires batteries inside the
flash unit. Do not remove the batteries.
In continuous shooting with the DC Unit, to prevent flash
head deterioration caused by heat, do not exceed the maxi-
mum number of flash listed below.
It is recommended to rest for more than 10 minutes after
firing near the maximum numbers.
SB-25 Flash
mode
TTL Auto Flash
SD-8
15
Maximum number of flash
SD-7
15
Non-TTL Auto
Flash
15 15
Manual Flash
15 (at full or
1/2 power)
40 (at 1/4 power or
less) 15 (at full or
1/2 power)
40 (at 1/4 power or
less)
Repeating Flash
15 15
Maximum consecutive firing
Specifications
All performance data are for normal-temperature operation
(20° C/68° F).
Electronic construction:
Automatic Insulated Gate Bipolar Transistor (IGBT) and
series circuitry.
Zoom capability:
Seven settings — 20mm (with the built-in wide flash
adapter), 24mm, 28mm, 35mm, 50mm, 70mm, 85mm;
auto power zoom with the Nikon F90-Series/N90, F4-
Series, F-801/N8008 and F-801s/N8008s; manually set
with other cameras.
Bounce capability:
Flash head tilts down to –7° or up to 90° with click
stops; flash head rotates through an arc of 270°, 90°
clockwise and 180° counterclockwise with click stops;
at front and vertical positions, flash head can be locked
Power source:
Four 1.5 AA-type penlight alkaline-manganese, or 1.2V
NiCd batteries; optional Battery Pack SD-8 and SD-7
are available as an external power source.
Power switch:
Three positions are provided — OFF, STBY (standby)
and ON; at STBY position with Nikon F90-Series/N90,
F4-Series, F-801/N8008, F-801s/N8008s, F-601/N6006,
F-601
M
/N6000, F-401x/N5005, F-501/N2020, F-301/
N2000, F-401/N4004, F-401s/N4004s, FA, FE2, FG,
Nikonos V, FM2 or FG-20, SB-25 turns off automatically
when flash unit is not used for approx. 80 seconds, and
turns on when camera is turned on.
Flash duration (approx.):
1/1000 sec. @ 1/1 (full) output
1/1100 sec. @ 1/2 output
1/2500 sec. @ 1/4 output
1/5000 sec. @ 1/8 output
1/87000 sec. @ 1/16 output
1/12000 sec. @ 1/32 output
1/23000 sec. @ 1/64 output
Guide number (at ISO 100: for m/ft.):
Angle of coverage:
Light
output
1/1 (full)
20mm 24mm 28mm 35mm 50mm 70mm 85mm
20/66 30/98 32/105
1/2 14/46 21/69 23/75
1/4 10/33 15/49 16/52
1/8 7/23 10/33 11/36
1/16 5/16 7.5/25 8/26
1/32 3.5/11 5.3/17 5.7/19
1/64 2.5/8.2 3.8/17 4/13
36/118
26/85
18/59
13/43
9/30
6.4/21
4.5/15
42/138
30/98
21/69
15/49
10/33
7.5/25
5.3/17
48/157
34/112
24/79
17/56
12/39
8.5/28
6/20
50/164
36/118
25/82
18/59
13/43
9/30
6.3/21
Zoom-head position
Zoom-head position Horizontal coverage Vertical coverage
20mm 102° 90°
24mm 78° 60°
28mm 70° 53°
35mm 60° 45°
50mm 46° 34°
70mm 36° 26°
85mm 31° 23°
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