From the Manufacturer:
The MG8000 features an extreme level of creativity and professional performances. High heat resistance materials and quartz tube design reduce the heat effects significantly, emitting with full flash without overheating problems and achieving above 1000 times continuum. Assorting with Power Pack PS300 enables blazing fast and maximizes the performance extremely.
Extreme High Heat Resistance: The high heat resistance materials developed for this unique model allow it to achieve more than 1000 times continuum emitting with full flash power without overheating problems.
Equipped with Flash Diffuser: For full frame digital SLR camera, you can greatly expand the flash illumination angle and also weaken the shadow of the edge from direct flash lighting, suitable for portrait photography.
Using the Quartz Tube Design: Capture the important moments, and reliably in the extreme case of high power and high frequency flash shooting, without concerns about overheating flash effects.
Perfect Combination: High-performance MG8000 with the Nissin Power Pack PS300 can speed up the recycle time, perfectly to achieve high power and frequency of flash photography.
Auto Rotation & Color Display: The color display will automatically rotate from horizontal to vertical as the flash is rotated and the user friendly six icon interface represents each of the modes of operation– Auto, TTL, Manual/Av, Multi, Wireless TTL (Master/Remote) and Customer Setting.
External Service Box: The External Power Pack Socket on the MG8000 supports the Nissin Power Pack PS300.X terminal for flash synchronization. The MG8000 also has a USB port to upgrade to the latest firmware.
Quick Loading Battery Magazine: The MG8000 has a battery magazine system which is the same as the Di866. A convenient battery magazine provides all four AA batteries load in the same direction, so that the batteries can be correctly inserted without fail even in the poor light condition.
My TTL: The TTL exposure level is accurately calibrated for standard balance in accordance with Nissin’s standard. If any adjustment is however required, or if you like to set your own preferable level, it can be adjust for about ±3Ev. by every 1/3.
Wireless TTL: The MG8000 Wireless TTL system supports Nikon i-TTL. MG8000 can be used in combination with Nikon original flash units as either Master or Remote (Slave).The MG8000 also supports digital (pre-flash system) and analogue (film type camera’s flash and/or studio flash under both of Manual and Av. priority mode.
Rear Curtain Sync and High Speed Shutter: In Rear curtain sync., the flash fires just before the rear curtain closes. By using this function at slow shutter speeds, a moving subject will appear with such moving marks behind. High speed sync. is recommended for daylight flash photography.
Usable Camera: Nikon iTTL flash system SLR amd hotshoe type
Guide Number: 60/198 at 105mm focal length (ISO 100 m/ft)
Wattage: 83 Ws. at full power
Illumination: 24-105mm (external diffuser)
Power Source: 4 X LR6 batteries (Size AA Ni-MH or lithium batteries usable)
Battery Life: 150-1500 flashes according to the mode (with alkaline batteries)
Energy Saving: Stand-by mode in 30 seconds, and power off timer can be set
Recycle Timer: 5.5 seconds with fresh alkaline batteries for full power
Flash Duration: 1/300 seconds (full power flash); 1/300-1/30,000 seconds (controlled flash)
Wireless Flash: Wireless TTL off camera flash system (Master or Remote)
External Power: Nissin Power Pack PS300; Nikon Power Assist SD-8A / SD-9
USB Port: For firmware update service
Dimensions: 5.8 x 3.1 x 5 inch (148x78x127mm)
Weight: 14.7oz / 416g (w/o battery)