Nikon SB-28 - Manual (Page 82)

Conditions necessary to activate the AF assist
illuminator LED:
1 The subject must be sufficiently dark and within the range of 1m
(3.3 ft) to 8m (16.4 ft) at 20°C (68°F).
2 AF Nikkor lenses must be used.
Lenses from 24mm (35mm for F-501/N2020) to 105mm are recommended.
Other AF Nikkor lenses can be used depending on shooting conditions.
Perform test firing before use.
3 The camera's autofocus mode is set to Single Servo Autofocus (S).
4 Focus lock is not employed.
5 The SB-28’s ready-light is on.
• Replace batteries whenever the ready-light becomes dark or blinks after
the AF assist illuminator LED turns on.
NOTE
If the AF assist illuminator LED comes on but no in-focus indicator appears
in the camera's viewfinder with the shutter release button pressed halfway,
the subject is outside the flash shooting distance range. In this case, set
the camera’s focus mode selector to manual
ƒ and focus manually.
To cancel autofocus flash operation with the AF assist
illuminator LED
Hold down the
µ button as you press the } button.
—The
; indicator comes on or disappears on the LCD panel every time you
press the
µ and }
buttons simultaneously.
—The AF assist illumination LED is set when the
; indicator is not on and
canceled when the
; indicator appeared.
—The AF assist illumination LED is preset to operate when the SB-28 is shipped
from the factory.
82
Autofocus flash operation in dim light
For autofocus cameras only