Nikon D300 User Manual page 763

Figure 12-8. Commander mode setup screen
If you leave Custom setting e4 > Modeling flash set to the
factory default ON, you can test-fire your Speedlight's
built-in modeling light by pressing and holding the camera's
Depth-of-field preview button. Or, if you prefer, simply take a
picture and look at it.
If the main flash is too bright, you can either move it farther
away or dial its power down by setting compensation (Comp.)
to underexpose a little. You can set Comp. in 1/3-stop
increments, so you have very fine control of each group's
flash output. The point is that you can experiment until you
get the image just the way you want it. Sure, you could do
things the old way and use a flash meter or get your calculator
and figure out complex fill ratios. Or, you can simply use
CLS to vary your settings visually until the image is just right
(see Figure 12-9).
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