V1.02
Thom Hogan’s Complete Guide to the Nikon D300
Page 599
2500
f/6.3 to f/32
f/9 to f/32
3200
f/7.1 to f/32
f/10 to f/32
HI 0.3
f/7.1 to f/32
f/10 to f/32
HI 0.7
f/8 to f/32
f/11 to f/32
HI 1.0
f/8 to f/32
f/11 to f/32
Yes, that table means what you think it does: if you set
Program exposure mode using external flash, those fancy
wide apertures of your expensive lenses won’t ever be used.
Another issue to note with the D300 is that the focal lengths
the Speedlight uses are geared towards 35mm film, not the
D300’s 1.5x field of view reduction. This means that you’ll
normally be lighting a wider angle than the D300 is taking in,
wasting flash strength. Here’s a handy table to use when
shooting with a Speedlight flash:
D300 Safe Flash Head Focal Length Settings
Lens Focal Length
Set Flash to
14mm 20mm
17-18mm 24mm
20mm 28mm
24mm 35mm
35mm 50mm
50mm 70mm
60-70mm 85mm
>85mm 105mm*
*Assumes SB-800
In other words, if you have a 20mm lens on the D300,
manually zoom the flash head to the 28mm mark. The
settings in the above table are the closest that guarantee full-
frame coverage for the D300’s reduced sensor size, and
provide you the maximum flash power for that coverage,
extending the distance at which you can shoot with flash.
Yet another gotcha concerns AF Assist on external
Speedlights. The red focusing pattern that the SB-600 and SB-
800 throw out can’t be distinguished by the camera when