141140
Specifications
Flash exposure control:
Four flash modes are provided — TTL, A, M and
Repeating Flash
TTL mode :
Used with 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 and Nikonos V.
Usable aperture range in TTL mode:
f/1.4 to f/22 (at ISO 100).
Shooting distance range in TTL mode:
0.6 — 20m (2 — 66 ft.).
A mode
:
For Non-TTL Auto Flash operation, light is measured via
light sensor in front of the flash unit.
Usable apertures in A mode:
f/2, f/2.8, f/4, f/5.6, f/8 and f/11 (at ISO 100)
Shooting distance range in A mode:
0.6 — 20m (2 — 66 ft.).
M mode :
For Manual Flash operation, light output amount can be
varied from 1/1 (full) to 1/64 output (total of 18 steps in
1/3 increments).
Flash sync mode selector:
position is used for front-curtain sync with
all the cameras listed in this manual.
position is used for Rear-Curtain Sync flash with
F90-Series/N90, F4-Series, F-801/N8008 and
F-801s/N8008s.
Red-eye reduction control:
Preflashes are fired to reduce the likelihood of red-eye
effect when used with F90-Series/N90.
AF assist LED:
In insufficient light, automatically fires LED beam toward
subject when performing autofocus with Nikon F90-
Series/N90, F4-Series, F-801/N8008, F-801s/N8008s,
F-601/N6006, F-401x/N5005, F-501/N2020, F-401/
N4004 or F-401s/N4004s.
Number of flash and recycling time at manual full light
output:
Batteries
AA-type alkaline-manganese
Number
of flash
(approx.)
Minimum
recycling
time**
(approx.)
100 times 7 sec.
Recycl-
ing time
(approx.)
7—30 sec.
AA-type NiCd 40 times 5 sec. 5—30 sec.
External power
source SD-7*
C-type
alkaline-
manganese
200 times
300 times
400 times
6 sec.
6 sec.
6—10 sec.
6—30 sec.
External power
source SD-8*
AA-type
alkaline-
manganese
100 times
200 times
250 times
3 sec.
3—5 sec.
3—9 sec.
3—30 sec.
External power
source SD-7*
C-type
NiCd
140 times 1.6 sec.
1.6—30
sec.
External power
source SD-8*
AA-type
NiCd
100 times 1.6 sec. 2—30 sec.
* With either alkaline-manganese or NiCd batteries installed in the SB-25.
**Data measured with fresh batteries.
Note: Data for light output at 1/1 (full), no use of AF assist LED and LCD panel
illuminator.
Ready-light/Open-flash button :
Indicates recharged battery power (ready-light). In TTL
Auto and Non-TTL Auto Flash mode, indicates possible
underexposure by blinking. In Non-TTL Auto Flash
mode, can be used as a test-firing button for light-
amount detection. In Repeating Flash mode, can be
used as a test-firing button for preset strobo flashes.
Built-in diffuser card:
In bounce flash photography application, creates natu-
ral lighting for catchlight in subject’s eyes.
Mount pin:
Fixes F90-Series/N90 on the hot shoe.
LCD panel illuminator:
Activated with button. Illumination lasts approx.
eight seconds; same button turns illumination off.
Flash shooting distance scale:
Measurement systems can be switched between meters
and feet using the lever inside the battery chamber.
FP High-Speed Sync flash:
Available with the F90-Series/N90. Enables higher shut-
ter speeds (1/250 sec. or faster) for flash synchroniza-
tion.
Monitor Preflash:
Available with F90-Series/N90 cameras when used with
an AF Nikkor lens.
Other features:
External power source terminal, TTL multiple flash ter-
minal and Sync/multiple flash terminal.
Dimensions (W x H x D):
Approx. 79 x 135 x 101mm (3.1 x 5.3 x 4.0 in.)
Weight (without batteries):
Approx. 380g (13.4 oz.)
Accessory provided:
Soft Case SS-24
Specifications and designs are subject to change without
notice.
Chapter
5
SB-25_En 03.1.14 8:18 PM Page 140
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