Set the control on the YS-90 Auto to match the f-stop of your digital camera. The YS-90 Auto will automatically put out just the right amount of light.
Guide number: 22 (land, ISO 100/meter) (full power)
Coverage angle: 105 X 95?
Battery life: 200 flashes (alkaline battery at full power), 260 flashes (1700mA Ni-MH battery at full power), 120 flashes (Ni-Cd battery at full power), 300 flashes (Lithium battery at full power)
Aperture control knob: 12 steps
Color temperature: 5,400?K (5100?K with diffuser)
Battery requirement: 4 X AA alkaline (6V), Ni-Cd (4.8V) or Ni-MH (4.8V) batteries
Depth rating: 60m/200ft
Dimensions (H X W X D): 115 X 88 X 175mm / 4.5 X 3.5 X 6.9 inches
Weight: 740g/1.6 lbs (land), -80g / 3.1 oz (underwater)
Over-pressure relief valve