⚡ GN33 output — dual discharge tubes

Two straight discharge tubes deliver guide number 33 — one of the highest among general-purpose underwater strobes. With the included flat diffuser attached, beam angle expands to 100° × 110° (GN28). An optional dome diffuser opens it to 150° × 170° for fisheye coverage.

📸 Three shooting modes

DS-TTL II for multi-brand auto exposure; RC mode developed in collaboration with OM Digital Solutions for OM SYSTEM cameras; Manual mode with 11 steps (GN1 to GN33) for full creative control. Mode is identified by indicator colour so you always know your setting at depth.

🔆 Aspherical toroidal lens — even light edge to edge

SEA&SEA’s proprietary lens design eliminates the hot-spot centre and uneven fall-off of conventional strobe optics. The result is clean, consistent illumination across the entire frame — essential for wide-angle and split-shot work.

🎯 LED target light — adjustable 150 / 300 lm

Two-stage target light for focus assist and beam angle checking. Bright enough to use in blue water, subdued enough not to spook subjects.

🔋 AA batteries — widely available worldwide

Runs on four AA batteries (alkaline or Ni-MH). Up to 140 flashes (alkaline) or 220 flashes (Ni-MH) at full power. 1.7-second recycle time on Ni-MH. No proprietary charger to forget.

⚖️ Near-neutral buoyancy underwater

With ball mount and clamp installed, the YS-D3 DUO is approximately −20g underwater. Your rig balance stays consistent regardless of strobe position.

• Ball Mount Strobe Adapter
• Flat Diffuser
• Silicone Grease
• Hex Wrench
• Diffuser Strap
• Rubber Cap for Fibre Optic Socket

Fibre Optic Cable not included.

Guide Number: 33 (28 with diffuser) · Beam Angle: 80°×105° (100°×110° with diffuser) · Modes: DS-TTL II / RC / Manual (11 steps) · Power: 4 × AA · Recycle: 1.7s (Ni-MH) / 3.5s (alkaline) · Colour temperature: 5,800K (5,500K with diffuser) · Depth rating: 100m · Dimensions: 92×111×147mm · Weight: 610g (land) / −20g (underwater)