Einstein Flash Unit E640

Articlecode: E640
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Available in store

Product information
  • 9 f-stop power variability (2.5 Ws to 640 Ws)
  • Adjustable in precise 1/10 f-stops
  • All-digital control from LCD display
  • Global plug-and-play from 95 to 265 VAC
  • Action stopping flash durations as short as 1/13,500 sec. (t.1) (1/54000s. (t.5)
  • Color consistency +/- 50K at any power
  • Bright, adjustable 250 W modeling lamp
  • Frosted dome cover reduces UV emission
  • Audible and visual recycle indicators
  • Compatible with all BUFF light modifiers, light stands, CyberSync™ remotes, and Vagabond™ systems
  • 2-Year Factory Warranty
  • For the shipping costs per country see our shipping & Returns page



  • 1x Einstein Flash Head E640
  • 1x Glass Dome Cover
  • 1x Protective cover Einstein Flash
  • 1x 250 Watt modeling lamp
  • 1x Flashtube for Einstein E640
  • 1x 3m (457,2 cm) sync cord (1/8" to PC)
  • 1x Down-angle 3m, 2-prong grounded power plug optionally
  • 1x Back-up SR5-F type 8A fuse
  • 1x Einstein owner's manual



The Einstein™ Flash Unit features action stopping flash durations, color consistency, and the broadest power range. The flexibility of the power range allows for everything from over-powering the sun, to shooting indoor portraits with a wide-open aperture. 

Perfect for: Professional photographers in any field.

Sync Cord Compatibility: All Paul C. Buff, Inc. flash units arrive with a 15' sync cord for connecting to a camera's PC sync terminal. Not all camera's are equipped with a PC sync terminal. If you plan on using this cable, and not wireless remotes, you may need a hot shoe adapterCheck your camera's compatibility. 

Find out how the Einstein compares to our other flash models.



Article number: E640

EAN: E640

Weight: 3000

Colli: 1

Flash UnitEinstein™ Flash Unit
Wattseconds640 Ws
Power Variability9 f-stops (full to 1/256 power)
Recycle to Full1.7 sec
Recycle to Half Power1/2000 sec. (at full power)
Flash Duration (t.5)1/2000 sec. (at full power)
Flash Duration (t.1)Action Mode : 1/588 sec. (at full power) | 1/13,500 sec. (at 1/256 power) / in Color Mode 1/588 sec. (at full power) | 1/8,000 sec. (at 1/256 power)
Power RequirementsAutomatic power switching from 95 to 265 VAC, 50/60 Hz (no lamp change or user attention required)
Average Current DrawBrief initial recycle surge current of 8.5A; average draw of 8A
Sync / Trigger VoltageLess than 5 volts (safe for use with DSLR cameras)
Modeling Lamp250 W, 120VAC bayonet-style quartz bulb
Flashtube12mm flashtube (daylight-balanced and UV-coated
Stand MountFits stands up to 5/8 in.
LCD DisplayBack-lit, high-resolution color LCD. 320x240 pixels; 2.4 in.
Umbrella MountAccepts umbrella rods up to 9mm
Weight4 lbs. 5 oz. / 1.81 Kg.
Dimensions17.78cm (H) x 13.72cm (D) x 19.81cm (L)
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Einstein Flash Unit E640
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