Nikon SB-27 instruction manual Autofocus flash operation in dim light

Autofocus flash operation in dim light

(For AF SLR camera only)

Conditions for autofocus flash operation with the AF assist illuminator LED

1)The subject must be sufficiently dark to activate the autofocus assist illuminator LED.

Please note that AF assisted autofocus range extends from 1m (3.3 ft.) to 5m (16.4 ft.) at 20˚C (68˚F).

2)AF Nikkor lenses must be used.

Using AF Nikkor lenses, SB-27's focal length coverage ranges from 24mm (35mm for F-501/N2020) to 105 mm.

Other AF Nikkor lenses may also be used depending on shooting conditions. Be sure to take a few trial shots first.

3)The camera's autofocus mode should normally be set to Single Servo AF (S).

4)Focus lock is not in use.

5)The ready-light is ON.

If the ready-light becomes dim or blinks after the AF assist illuminator LED lights up, replace the SB-27's batteries with a fresh set.

*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 beyond autofocus distance range. Set the focus mode to "Manual" and focus manually on the clear matte field.

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