AndrewDobbie PRO 9:24am, 27 May 2011
Does anyone know what the flash duration is on this model?
Photon47 Posted 6 years ago. Edited by Photon47 (member) 6 years ago
Don't know if you are still interested in an answer, but basically, if flash duration is a consideration, this is not the flash for you.

At that price point, you get either flash duration or consistency. The Genesis in my experience has great consistency both in terms of power output and color temperature (much more so than all other "budget" studio flashes I have seen so far), but the flash duration is quite long and you tend to get quite visible motion blur when shooting fast movement. I can't give you an exact t.5 or t.1 number, though, since I haven't done any scientific tests.

For subjects like ballet dancers, I usually use a set of several hotshoe flashes nowadays since they have extremely short flash durations. If that is not an option for you, you'll probably have to bite the bullet and get a Profoto or Broncolor system, but that is significantly more expensive obviously. On the other hand, you can always rent these things on a per-shoot basis.
Vphotographic_ltd 6 years ago
My 300b can't have that long duration as I cant hypersync it past 1/500 and it's my believing that to hypersync you need a slow duration !!
Photon47 6 years ago
Sorry, I'm not familiar with the term hypersync, are you referring to that high speed/Auto FP setting or whatever it is called that Nikon cameras offer? I think that function uses several pulses and can only be used with speedlights as far as I know.

Or do you mean syncing at high sync speeds with cameras with an electronic shutter (like the Nikon D70s) or a leaf shutter (like many medium format cameras have them)?
In that case, well, you wouldn't get any visible black bars or anything like you would when shooting flash above your maximum sync speed, but you would only capture part of the full power output of the 300B since you'd only be exposing for part of the flash duration. The flash would essentially be behaving like continuous light in that situation.

One could verify that theory by varying the shutter speed and checking if the brightness of the images varies when using very short shutter speeds (I'd try the highest power setting since that should have the longest flash duration). Maybe I'll do that test some day if I can find the time.

All I can say for now is that I came across visible motion blur in several instances, and it wasn't caused by the modelling light or ambient, so I am assuming the 300B has a rather long flash duration.
Nikonparrothead 6 years ago
Just saw this thread. A friend had borrowed my 300B long term and I'd just gotten it back. For kicks I tried hypersync on it yesterday, using the Pocketwizard Control TL for Nikon triggers -- latest firmware, set according to Tom Bol's findings for a D800 -- even though I shoot with a D700.

I literally did living room tests at full power but the flash was able to hypersync all the way to 1/8000 of a second. I may try it out next time I have the opportunity.
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