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Sea & Sea YS-D2 Strobe Head

The YS-D2 (made in Japan) is the most advanced strobe SEA&SEA has produced in its 40 year history. Drawing on inspiration from the YS-110, YS-110 Alpha and YS-50Pro, the YS-D2 is robust in features, but compact in size.
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SEA & SEA YS-D2 Strobe Head - YS-D2J

 The complete underwater strobe for Sea&Sea which realizes power, speed and quality.

This strobe has been discontinued - please see the new YS-D3 or the amazing INON Z-330

Includes: YSD2 strobe head, 1 x 100 degree diffuser, 1 x 120 degree diffuser, 1" ball mount adaptor,  2 x red filters, 2 x diffuser straps, o ring grease. YS-mount NOT INCLUDED.

YSD2 Features & Specifications:

The illuminated control panel is ideal for night diving.

You can check which mode the strobe is set even under pitch-black conditions, the colour of illumination changes to indicate mode:

  • Aqua blue (in DS-TTL mode)
  • Blue (in slave TTL mode)
  • Orange (in manual pre-flash mode)
  • Green (in manual mode without pre-flash)

Maximum guide number is a powerful 32 (ISO 100, meter). Recycle time is only 1.5 sec approx. when nickel hydride AA batteries are used.

The YS-D2 is powerful enough to illuminate a wide area, even under very bright conditions with plenty of natural sunlight. During macro photography, where subtle exposure control is required, manual mode can easily be selected and the guide number quickly adjusted as low as 1.

SEA&SEA’s own automatic exposure control system, DS-TTL ll, has been further improved. Tuning light emitting timing in detail and adding light emission detection function, the accuracy of automatic TTL exposure has been noticeably improved. Previously, TTL photography was difficult with the lens’s aperture wide-open (maximum aperture) and images were likely to be overexposed. It is now possible to give a low powered flash so the correct exposure can be easily achieved with the YS-D2.

EV control function can finely tune the amount of light emitted

By controlling the actual flash light level, the strobe achieves accurate exposure compensation with EV compensation. As the exposure compensation range has improved to +/- 2.0 EV, users can concentrate on shooting even more creative images. (-2,0EV, -1.5EV, -1EV, -0.7EV, -0.3EV, +0.3EV, +0.7EV, +1EV, +1.5EV, +2.0EV).

Two diffusers and red filters included with the strobe as standard

By attaching one of the included diffusers, the beam angle is increased to 100 degrees or 120 degrees (circular) with a soft and even light. The red target light filter helps avoid disturbing skittish creatures that are likely to react to normal light. The red filter is fitted inside the diffusers.

The target light can be adjusted in 2 steps.

The strobe is equipped with a target light (approximately 100/300 lumen). In use (target light switch in ON position), the light will be automatically turn off when the strobe fires and will automatically turn back ON after 0.5 sec.

Ergonomically improved controls

Handling is greatly improved. Larger knobs and a new magnetic rotary switch help prevent controls being accidentally reset in use. With the new controls, quick operation is possible when photo opportunities suddenly appear.

Custom mode is a new innovation which allows the YS-D2 to be compatible with cameras with non-standard pre-flash settings

Some manufactures use their own pre-flash timings on their cameras. The new custom function means the YS-D2 can be compatible with cameras with non-standard pre-flash in DS-TTLII and manual modes.

The strobe can be attached to an arm with the YS-mount or the ball-mount (ball-mount included YS mount not included).

Choosing the right cable

In accordance with the camera and housing you use, choose either a fibre-optic cable (optional) or sync cord (optional) to connect the strobe.


Guide Number (ISO 100/m) (land) : 32, 24 (with Diffuser 100 attached) & 20 (with Diffuser 120 attached)

Beam Angle : 80°x80°  (without Diffuser) / 100°x100° (Diffuser 100) / 120° x 120° (Diffuser 120)

Batteries : 4xAA A: 6V Ni-MH: 4.8V

Number of Flashes *1 : A: 150 Ni-MH: 200

Recycle time (full) *2 :   A: 3.0 sec. Ni-MH: 1.5 sec.

*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 2400 mAh batteries.

Colour temperature : 5600K

Colour temperature w/diffuser] : 5250K

Depth rating]: 100m / 330ft

Dimensions (WxHxD) - Excluding protruding part(s) and the arm holder.- : 89x133x116mm / 3.5 x 5.2 x 4.6 inches (incl. YS base but excluding protruding parts)

Weight : 623g / 22.0oz (w/o batteries)

Underwater weight :  Approx.+40g / 1.4oz (incl. batteries)

Exposure control: DS-TTL II,  Slave TTL, Light level control dial (GN): 1 / 1.4 / 2 / 2.8 /4 / 5.6 /8 / 11 / 16 / 22 / 32 (11 steps)

Pre-flash control: Equipped with pre-flash cancel mode

DS-TTL II function

Slave function

Auto power OFF function

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

Over-pressure relief valve

LED target light (output is adjustable in 2 steps)

Audible charge signal

* When the YS-D2 is used with a camera with built-in flash in housing, use the Fibre-Optic Cable.


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.