Nikon SB-27 User Manual download pdf (Page 48)

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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Nikon SB-27 User Manual Page 48