SEA&SEA YS-D3 DUO Strobe Head


SKU: SAS-YSD3DUO Categories: ,


The YS-D3 DUO is a high-specification underwater strobe with three shooting modes: DS-TTL, RC mode, and manual. It delivers even and uniform light distribution with a large light output of GN33. Custom settings allow the strobe to be used with high precision with a variety of cameras and shooting styles.

Shooting Mode

The mode switch can be used to switch between “DS-TTL”, “RC mode”, and “Manual”. Each mode is conveniently identifiable by colour.

Shooting in RC mode

When shooting in RC mode with an OM SYSTEMS (OLYMPUS) camera, no custom settings are required. Select “RC mode shooting” in the flash mode setting on the camera side; YS-D3 DUO should be set to “RC” for shooting mode.

*For details on “RC mode shooting,” please refer to the user’s manual of the camera to be used.

Highly accurate DS-TTL dimming

DS-TTL dimming accuracy has been greatly improved by adopting a newly designed light-receiving sensor. By applying detailed custom settings, it can be used with high accuracy with various cameras of multiple brands.

*When shooting TTL with a camera of a brand other than OM SYSTEM (OLYMPUS), select DS-TTL as the shooting mode.

*Pre-custom settings must be made for each camera in advance when shooting with DS-TTL.

RC System

The “RC System” is a flash system for OM SYSTEM digital cameras, and the YS-D3 DUO was developed in collaboration with OM Digital Solutions to incorporate the RC mode.

RC mode is a light control mode in which the camera automatically controls the flash output based on the brightness through the lens. The YS-D3 DUO is equipped with a more precise “RC mode” based on system information officially provided by OM Digital Solutions.

*Since the strobe is system-linked to the camera, flash output compensation can be adjusted not only on the strobe side but also on the camera side while shooting in RC mode.

*Setting the camera to RC mode can prolong (save) the camera’s battery life.

Manual mode has 11 steps

In manual mode, the light intensity can be adjusted in 11 steps. The settings are (GN: 1 / 1.4 / 2 / 2.8 / 4 / 5.6 / 8 / 11 / 16 / 22 / 33). The value can be easily seen on the scale on the light intensity adjustment dial. Compatible with digital cameras that do not have a pre-flash function.

*If your camera housing is equipped with a strobe connector, you can also use a sync cord to connect the strobe for manual strobe triggering.


The YS-D3 DUO can be set up with high precision to accommodate a variety of shooting styles with different cameras by making custom settings. Refer to the table for settings according to the shooting mode used and the method of synchronizing the camera and strobe.

Light source

This is a high-performance strobe that pursues quality of light, and its high luminous flux and wide beam angle are effective for wide-angle photography with fish-eye lenses and other wide-angle lenses. The strobe also features our proprietary light distribution technology.

High light intensity GN33

The light output has a guide number (GN) of 33, one of the highest among general-purpose underwater strobes. The use of two discharge tubes increases power and achieves GN 33 at full flashing.



Specification Value
Guide Number 33, 28 (with Diffuser attached)
Beam Angle 80°x105° (without Diffuser), 100°x110°(with Diffuser)
Usable Batteries 4xAA A: 6V Ni-MH: 4.8V
Number of Flashes *1 A: 140 Ni-MH: 220
Recycle time (full) *2 A: 3.5 sec. Ni-MH: 1.7 sec.
Colour temperature 5800K (w/diffuser 5500K)
Depth rating 100m / 330ft
Dimensions (WxHxD) 92x111x147mm / 3.6 x 4.4 x 5.8 inches (excluding ball base)
Weight 610g / 21.5oz (w/o batteries) (excluding ball base)
Underwater weight Approx.-20g / -0.7oz (incl. batteries ball base)


Exposure control: DS-TTL II, Light level control dial (GN): 1 / 1.4 / 2 / 2.8 /4 / 5.6 /8 / 11 / 16 / 22 / 33 (11 steps)

Pre-flash cancel function

Auto power OFF function

Sync cord: 5-pin Sync cord/N, Fiber-Optic Cable

Over-pressure relief valve

LED target light (output is adjustable in 2 steps [300lumen/150lumen])

Audible charge signal

[Set Items] Ball Mount Strobe Adaptor、Diffuser、Slicon grease

*1 Number of flashes and recycle time depends on the battery brand, temperature and frequency of use.

*2 Number of flashes and recycle time of Ni-MH batteries were tested on 1900 mAh batteries.


* We recommend the use of a AOI FOC-PA-AM2-V2 Fibre Optic Cable 613 Core or the SEA&SEA Fiber-Optic Cables. SEA&SEA strobes may not function properly with low-quality fiber optic cables (functions such as TTL auto exposure in particular).

*Do not use non-recommended batteries (such as lithium primary batteries). Use of non-recommended batteries may cause battery leakage and overheating and may cause the strobe to rupture, which could result in personal injury.


Download SEA&SEA YS-D3 User’s Manual here


Sea & Sea

Sea & Sea has been a leader in Underwater Photography since 1972 and produces Underwater Flash Units, Waterproof Aluminium Housings for select Mirrorless and DSLR cameras and a wide range of accessories. All Sea & Sea products are developed and manufactured in Japan with the user in mind. They are easy to use and convenient in design. High-quality Japanese manufacturing procedures guarantee years of optimal use of each Sea & Sea product. Underwater Cameras is an official dealer for Sea & Sea products in Australia.
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