From compact digital cameras to digital SLR cameras.
Un pequeño flash manual y DS-TTL

Multiple features condensedinto a compact design
Circular beam angle of 100°x100° and guide number of up to 20. The YS-01 is a new compact-type slave strobe that can be used for all applications from wide-angle to macro photography.
You can switch between DS-TTL (Digital Slave TTL) and a ten-level manual control function, to enable fine adjustment of the light level according to the photographer's intentions. You can also set up a lighting system that uses two strobes in DS-TTL mode. Power comes from four AA batteries for a powerful and long-lasting strobe. You can enjoy taking pictures all day long without having to recharge the batteries. The recycle time takes about two seconds with nickel-metal hydride batteries (2700 mAh) for stress-free continuous shooting. The YS-01 is furnished with a high-luminance white LED target light (1W) indicating the optical axis of the strobe attached to its front face that is effective for night diving.
You can fully exercise your creativity with the YS-01, which can be used as a primary strobe or secondary strobe in a wide range of applications, from compact digital cameras to digital SLR cameras.

The YS-D1 sets a new standard for underwater strobes. From subtle light output as low as guide number 1 to a maximum power of guide number 32, control of underwater lighting has become effortless with the YS-D1.

Equipped with SEA&SEA’s new slave TTL system called “DS-TTL ll”
Revising the algorithms used for the DS-TTL system, the YS-D1 employs a totally new slave TTL system. The strobe can adjust the interval between the pre flash and the primary flash in order to be compatible with a wide-variety of cameras, if not all, on the market today. The strobe is equipped with DS-TTL ll mode which is more responsive, more precise and more reliable. The DS-TTL ll enables a variety of strobe sync photography such as slave TTL and slave manual (11 steps) with compact or digital SLR cameras. When used with a digital SLR camera in housing, the strobe can also be connected with a conventional sync cord and through a YS Converter for TTL strobe photography. In a clear water environment, two YS-D1 strobes in DS-TTL ll mode provide perfect lighting. When you would like to emphasize contrast, setting the main strobe in DS-TTL II mode and the secondary strobe in manual mode (11 steps) offers flexibility without limiting control. When underwater visibility is poor, two YS-D1’s set to manual mode may produce the best images.
The YS-D1 is the most versatile underwater strobe available today. The DS-TTL exposure compensation function enables subtle lighting control by adjusting the Light Level dial in DS-TTL mode.

[ YS-D1 ]
[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: 250
[Recycle time (full)*2] : A: 2.8 sec. Ni-MH: 1.9 sec.
[Color temperature] : 5600K
[Color temperature w/diffuser] : 5250K
[Depth rating] : 100m / 330ft
[Dimensions (WxHxD)] （Excluding protruding part(s) and the arm holder.）: 87x135x111mm / 3.5 x 5.4 x 4.4 inches
[Weight] : 650g / 22.9oz (w/o batteries) * Attached a YS Mount
Strobe Adaptor and a fixing bolt to the Strobe.
[Underwater weight] : 0.5g / 0.02oz(w/ batteries)
[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 / 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, Fiber-Optic Cable (L-type)
Over-pressure relief valve
LED target light

*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.