Essentially unused. Excellent health condition. Like new. I have two of these as well as would be willing to sell both for $375.
The AlienBees B400 is a highly effective, self-contained center flash device with flexible result from full power (160 Ws) to 1/32nd of the total power (5 Ws). This flashpower is changed on the back control board with a slide fader, qualified of adjusting in whole f-stop increments and almost everywhere in between. When changed from a greater to a lesser setup, the unit will automatically dispose the excess power for exact result.
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