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AF Assist LED — Autofocus Flash Photography in Dim Light
The SB-25’s AF assist LED enables you to perform autofo-
cus flash photography in dim light or even total darkness
with some Nikon AF cameras.
When ambient light is insufficient for autofocus operation,
the AF illuminator automatically turns on to start operation
and give contrast to a dark subject, allowing the camera’s
autofocus system to function as though it were daytime.
If ambient light is sufficient, the AF illuminator does not
light up.
Before proceeding:
✗ ATTACH SPEEDLIGHT TO CAMERA.
✗ TURN ON BOTH SPEEDLIGHT AND CAMERA.
✗ USE SINGLE-SERVO AUTOFOCUS (S or A)
✗ USE SINGLE-FRAME SHOOTING (S) FILM ADVANCE
MODE
Hints and Notes
• Check that the SB-25’s ready-light has come on.
• Lightly press the camera’s shutter release button to acti-
vates the AF illuminator LED. Do not use autofocus lock
function.
• Confirm whether in-focus indicator LED I in the camera’s
viewfinder appears.
If the in-focus indication does not appear inside the
viewfinder, the subject is beyond the autofocus distance
range (see at right “Notes of AF assist LED”); focus manu-
ally on the clear matte field.
Notes on AF assist LED
Autofocus distance range with AF assist LED depends
on the lens in use and subject’s reflection ratio.
For example, with an AF Nikkor 50mm f/1.8 lens
(including the latest D-Type lens) and a subject having
35% reflection ratio, you can perform autofocus from
approx. 1m (3.3 ft.) to approx. 8m (16.4 ft.), at 20˚C
(68˚F).
If the ready-light does not stay on after the AF assist
LED activates, replace batteries.
• In Rear-Curtain Sync Flash with the F-601/N6006, a light
pattern from the AF assist LED sometimes affects the pic-
ture. To prevent this, confirm that the LED light pattern
has disappeared before shooting.
• Usable autofocus lenses are:
With Nikon F-501/N2020: AF Nikkor lenses from 35mm to
105mm (including the latest D-Type)
With other cameras: AF Nikkor lenses from 24mm to
105mm (including the latest D-Type)
Chapter
4
F90-Series/N90
✗ F-501/N2020 ✗ Nikonos V
F4-Series ✗ F-301/N2000 F3-Series
F-801/N8008 ✗ F-401/N4004 ✗ F2-Series
F-801s/N8008s ✗ F-401s/N4004s ✗ FM2
F-601M/N6000 FE2
F-401x/N5005 ✗ FG
F-601/N6006 ✗ FA FG-20
APPLICABLE NIKON SLR MODELS
SB-25_En 03.1.14 8:18 PM Page 114
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