Press Mode Button, rotate Jog Wheel until third Flash icon and channel number are displayed. Release mode button, rotate Jog Wheel until desired channel is displayed, then press and release Measuring Button. Press ISO1 button to select desired ISO. Rotate Jog Wheel to select desired shutter speed. Now turn on remote strobes and wireless trigger devices, for example, Pocket Wizards. Hold meter on subject. Press Metering Button, which triggers remote flashes. If flashes don't fire right away, they may be asleep, so press Metering Button again to fire them up.

Set camera's settings to match meter's display (ISO, f stop, shutter speed). Adjust ISO or flash output/distance until desired aperture reading is achieved. When you're happy with meter reading -- for example -- ISO 400, shutter 1/200, f8 -- reset your camera's settings to match meter's reading. Take a test shot and adjust camera's settings as desired.

In Part 1 we set our light meter to ambient mode (Hold Mode button down while turning Jog Wheel until Ambient icon [*] and shutter priority icon [T] are selected). Hover cursor over this photo for notes. Lumisphere should be in extended position for incident light meter reading. Position meter on subject. Press Measuring Button to take ambient light reading. Set camera's settings to match meter's LCD display (ISO, f stop, shutter speed). Rotate Jog Wheel to select different reciprocal shutter speed/aperture combinations.

Once we're comfortable with measuring ambient light, let's move to Part 3, measuring flash output.