For my first bikepacking warming trip I’ll be carrying my Einstein 640 Studio Flash to analyze how many times I’ll need it’s full power and how convenient is to carry this flash & it’s battery pack on a bicycle… maybe two small & cheap YN560IV mounted on a flash bracket is all I need when combined with a leaf shutter camera (Fujifilm X100s) with a 1/1000s flash sync.

I used a previous version of these Chinese manual flashes and never had a problem with them. This new version adds a master mode (or a radio transmitter unit) built into the flash that controls remotely the flash power (and flash zoom length) of 3 individual groups of YN560III & IV flashes.

Techs Specs:
Circuit design Insulated Gate Bipolar Transistor (IGBT)
Guide No. 58 meters (ISO 100, 105mm)
Flash mode M, Multi
Triggering Mode Camera set-up, TX, TX, S1, S2
Zoom range 24, 28, 35, 50, 70, 80, 105mm
Vertical rotation angle -7~90 degrees
Horizontal rotation angle 0~270 degrees
Power supply 4×AAsize batteries (Alkaline or Ni-MH are usable)
Lighting times 100~1500 times (AA alkaline cell used)
Recycle time approx 3s (AA alkaline cell used)
Color temperature 5600k
Flash time 1/200s~1/20000s
Flash control 8 levels of output control (1/128~1/1), 29 levels of fine tuning
External interface hot shoe, PC port and eternal charging port.
Wireless triggering distance 100(2.4g wireless);20-25m indoor,10-15m out door (optical control)
Additional features The electronic flash head zooming, sound prompt, automatically saving setting, power saving mode, overheating protection and advanced options.


Photographer cycling "in developing" countries making + printing + giving away portraits for those families who had none...

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