3. The lighting. I mounted my Speedlights on tripods, using manual flash mode so I could tweak the output of each flash individually for natural-appearing, dappled light with implied dimension. I aimed for light levels that permitted exposures of about 1/250 sec at f/16 and ISO 400 or less. To tweak the dappled effect even more, I diffused the background fill flashes, and kept the mainlight direct and undiffused. To check exposure, I monitored the LCD on the camera, making sure my images were bright enough, with no blown highlights. When the scene seemed dark, I opened up to f/14. I didn't want to raise flash output much above 1/16 power, which translates to a flash duration of about 1/8000 of a second. Longer durations (i.e., higher flash output) would invite unwanted motion blur.