High Performance Strobe 

Newly designed circuitry and light-emitting unit produces powerful guide number of 33. In addition, a high precision aspherical optical troidal lens has been fitted over the two flash tubes to disperse an even light from the center to the edge. The strobe`s beam angle will increase to 110°by attaching the standard accessories Diffuser. When the optional Dome diffuser is attached, beam angle will increase to as wide as 150(TBD)


In order to avoid misunderstanding, the YS-D3 guide number (GN) and the beam angle are based on measurements taken on land (not underwater) 
Some competitors will often state a GN measured on land and the beam angle in water, for example a GN 33 and beam angle of 110 degrees. However, this GN 33 value is based on a beam angle of 60~70 degrees. The beam angle may be expanded in water by a dome effect, however the GN in water is significantly lower than the value measured on land. 

Note: A land-based strobe that uses the same four AA batteries as the YS-D3 may provide a notation that the GN is 60, but these measurements are taken under the condition that the focal length is equivalent to 200 mm (= beam angle 12 °). When the beam angle becomes narrower, the brightness of the illuminated area increases due to the light-collecting effect.

 

Aspherical optical troidal lens

 

Various accessories available for all underwater imaging experiences 

Click on the product name for more information.

Snoot (optional accessory)
A strobe adaptor which narrows the beam angle to be directed at a target point. Diameter of the opening 25mm. Designed with internal prism which aligns target light`s light axis and strobe`s light axis to the center.

Dome diffuser (optional accessory)
Increases beam angle to 150°×170° Essential accessory when fisheye lens is used, or soft light is required. + Guide number will drop to -1.5EV when it is fitted.

Flash prism (optional accessory)
Optical guiding device to fire the strobe when a fiber-optic cable is not used. This device is for manual use only. The device is effective if multiple strobes are used in a fixed position. However, the flash may not fire depending on the position of where multiple flashes are occurring in relation to that of the master flash.

SNOOT                                                                           DOME DIFFUSER                                              FLASH PRISM                       

Excellent visibility 

Backlight panel that is effective when shooting in dark environments. The indicator color on the back of the YS-D3 changes each time the position of the mode switch is changed. Blue (in DS-TTLII mode), Red (in RC mode), Yellow (in manual mode with pre-flash), and Green (in manual mode without pre-flash) The positioning of the operation system is obvious during night diving.

In DS-TTLII mode                                     In RC mode                                                    In manual non pre-flash mode

 

Connection method with arm that can be selected according to preference 

YS-D3 comes with a straight type ball base.
Optional YS base and new Diagonal ball base can be installed depending on the application.

YS base (common to YS-D1 / D2 / D3/DUO)
Traditional YS base. Easy vertical swing.

Diagonal ball base (only for YS-DUO/D3)
A ball base inclined at 35 ° compared to the straight type. This makes it easier to lower the strobe backwards, making it suitable for shooting when using a dome port. Also, when a Synchro Cord N is installed, interference between the cord and the ball clamp is minimized.

 

• [Guide Number (ISO 100/m) (land)] : 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.
• [Color temperature] : 5800K
• [Color temperature 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)
• [Others]
  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 / 33 (11 steps)
  DS-TTL II function
  Slave function
  Auto power OFF function 30min
  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 2500 mAh batteries.
  
  CAUTION
  * Use of genuine SEA&SEA Fiber-Optic Cables is recommended. SEA&SEA strobes may not function properly if a third-party Fiber-Optic Cables are used (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.