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| p.2 #1 · Einstein 640 vs Profoto D1 comparison by Kern-Photo |
I think the reason he shows the Einstein @ 1/16 power and the others (including his own B800) is to show each at their shortest flash duration. If he HAD shown the others @ 1/16 power (to get your "apples to apples") ... it would be WAY WORSE for the others as their durations would LENGTHEN even more. Then, everyone would be complaining that he didn't show the others at their shortest flash duration capability (i.e. @ full power). He fairly shows them in their peak performance for achieving their shortest flash duration vs. the Einsteins peak performance for achieving its shortest flash duration.
The Einstein has IGBT circuitry similar to hotshoe strobes so that flash duration SHORTENS as power is reduced. The others without IGBT circuitry LENGTHEN as power is reduced. In this regard he is fairly showing each at their shortest attainable flash duration. You just need to recognize the context of "shortest flash duration attainable" as the intent of the comparison.
He also shows the Einstein @ full power, and it shows it to be LONGER than all of the other models presented. But if you notice, that is correlated to the power of each unit, i.e. more power, longer flash duration.
The intent in this particular ad is to illustrate shortest attainable flash duration. For some folks, that won't make a hill of beans, for others ... it is something they are interested in. The mention that it can be achieved with a hotshoe strobe is likely correct BECAUSE, it also uses IGBT circuitry that SHORTENS the flash duration when power is reduced ... which why the Einstein was designed the same way.
THIS, imo is the biggest reason for getting an Einstein vs. others ... you like the fact that flash duration SHORTENS with reduced power. Beyond that paradigm difference ... things get a whole lot closer.
Lest you think I'm being a PCB fan-boy ... I'm considering a Profoto D1 250 for its full power flash duration @ 1/3700-1/1400s, whereas the 1000 has a duration of 1/1800-1/700s. Getting 1/3700 and 250ws seems like a nice combination, and even @ only 1/1400 (lowest power) that's still pretty quick. But if you are truly interested in short flash duration ... the IGBT circuitry of the Einstein is a different animal. Complaining about PCB won't change the fact that his use of IGBT circuitry achieves different kind of results than non-IGBT circuitry does ... whether that is vs. his own B400/800/1600 or other brands of non-IGBT circuitry.
While you can certainly use shoe mounted strobes and their IGBT circuitry that shortens flash duration with power reduction ... similar to the Einstein ... the shoe mounted flash starts around 60-80 ws (before power reductions begin), whereas the Einstein starts around 8X-10X that @ 640ws (before power reductions begin). Of course, you can always bank multiple shoe mounted strobes to get more power and retain short flash durations from each one individually. So, if you need more power than the hotshoe strobes still and shorter durations, the Einstein's IGBT circuitry is worth consideration.