V1.02
Thom Hogan’s Complete Guide to the Nikon D300
Page 623
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key to select the flash power to be used.
2.
Activate the flash by popping it up (press the Flash
Release button).
3.
Set the camera to Single Servo AF; flash only operates
when the camera achieves focus; this step isn’t
technically required, but I like to tell people to use it
as a reminder that focus has to be achieved for flash to
operate.
4.
Focus on your subject by pressing lightly on the
shutter release. Note the distance on the scale on the
lens.
5.
Aperture = GN / Distance
. Work the calculation and set the
correct aperture. (Determine the GN by looking at the
tables, below).
6.
Set the D300 to the exposure mode you wish to use,
and set your aperture and shutter speed, as usual. Just
make sure that the aperture you set matches the one
you just calculated in Step 5!
Internal Flash Guide Numbers (Feet)
Output Level
ISO 100 200
400
800
1600 3200
Full
Power 42 59 82 115 161 225
1/2
Power 30 42 59 82 115 161
1/4
Power 21 30 42 59 83
115
1/8
Power 15 21 30 42 59
83
1/16
Power 11 15 21 30 42
59
1/32
Power 7.8 11 14 21 30
42
1/64
Power 5.6 7.8 11 14 21
30
1/128
Power 4 5.6 7.8 11 14
21
