If size and weight are your primary deciding factors, the DS51 II is for you. The DS51 II is one of the smallest and lightest strobes in its class weighing in at less than one pound (443g) per strobe. The compact size makes it simple to position the strobe for macro, super macro, and close focus wide angle.
Specifications
Depth rating: 100 meters (330 feet)
Power: 1 to 50 Ws
Coverage angle: 80º with included diffuser
Power control: 6 stops in 1/2-stop increments
Color temperature: 5700K
Guide number at 1m (ISO 100): 17 full power
Flashes per charge: 300 to 1000 dependent on power setting
Recycle time: 0.1 to 3.5 seconds dependent on power setting
Electrical sync connection: Ikelite ICS 5-pin bulkhead
Battery: 4 AA cell alkaline, NiMH, or NiCad (not included)
Dimensions: 81 mm diameter x 119 mm length (3.2" x 4.7")
Weight: 443 grams (0.97 pounds) without batteries or mount
Buoyancy: Neutral in fresh water
In the Box
DS51 Strobe
Battery Door # 9440.45 (installed)
Diffuser # 0591.2 (installed)
1" Ball Mount # 4081.4 (installed)
Waterproof bulkhead cap # 9104.7 (installed)
Silicone lubricant 1cc tube
2 year limited warranty