Comments on: A Mobile Strobe with a Flash Duration of 1/25,000?!! Yes, Please.

By: R. J. Kern

R. J. Kern — Fri, 15 Mar 2013 16:23:00 +0000

It’s too bad that at full power, the flash duration is shorter than 1/1600 sync with the PhaseOne IQ back and a leaf shutter lens. That means that I’d have to use it no more than at 1/4 power in super bright sunny conditions which almost negates the super fast flash duration. Booo.

By: Spy Black

Spy Black — Fri, 15 Mar 2013 03:27:00 +0000

Yeah really, it doesn’t take much, and it will be cheaper yet if you use Yongnuo speedlites, 40 of these will only set you back $1700: http://www.amazon.com/Yongnuo-Flash-Speedlite-Yn-460ii-Pentax/dp/B003IZ9XTI

By: Matthew Wagg

Matthew Wagg — Thu, 14 Mar 2013 15:53:00 +0000

Want!

By: damianvines

damianvines — Tue, 12 Mar 2013 20:44:00 +0000

Marios, I’m assuming you’re talking about how fast the capacitor can fully deplete itself? This still does not answer the question about at what power or watt seconds you get the fast depletion or flash duration. The speed at which the capacitor can deplete itself is linked to how much power you’re asking of it.

By: Marios Karampalis

Marios Karampalis — Tue, 12 Mar 2013 20:21:00 +0000

To compare the time you must know the T1 of the battery if it is larger than T1:2000 it is good if it is 3000 you can do decent splash photography the best is 4000.
Profoto says T 0,5= 1/25.000 tha is more or less T1= 8000 inpressive!!!!

By: Paul Davies

Paul Davies — Tue, 12 Mar 2013 17:29:00 +0000

FAST!

By: Quentin Décaillet

Quentin Décaillet — Tue, 12 Mar 2013 08:19:00 +0000

The manual says: Flash duration in Normal mode: 1/5,500 – 1/2000 s // in Freeze mode: 1/25,000 – 1/11,000 s. While not extremely good, it’s still decent duration at full power.
But I much prefer the way the Ranger RX works. Meaning the shortest duration is at full power. It’s way more useful for outdoor sport and action photography IMO :)

By: damianvines

damianvines — Tue, 12 Mar 2013 01:11:00 +0000

Granted Quentin, you’d need about 6 SB-910′s to equal the 1,000 watt seconds of the Pro-B4 pack, but this article was boasting about the flash duration, not max power. There needs to be more data to know if at 160 watt seconds (that of a SB-910 at full power) whether this pack would be “faster” from a duration standpoint at that same power. I’m not knocking it, I love ProFoto’s gear, I just want to know the facts, I really want to know at “equal power ranges” is this pack actually faster that a speed-light? From what I can gather specs wise: To get an SB-910 to 1/20,000th of sec. you’re at 1/32nd power or 5 watt seconds. So based on any published specs, what is the watt seconds power at 1/20,000th of a second on the Pro-B4? I can assure you it’s not anywhere near the full 1,000 watt second power rating. But perhaps it is more than 5 watt seconds, I just want to know. :-)

By: damianvines

damianvines — Tue, 12 Mar 2013 00:34:00 +0000

You do not get 1/25,000 of a second at full power, you get 1/2,200 of a sec at full power. No better than a Speedlight.

By: Ryan Cooper

Ryan Cooper — Mon, 11 Mar 2013 23:07:00 +0000

Assuming they are far enough away for you to distinguish the difference between the two arrivals and that it is possible for Man A to reach the speed of light without his mass becoming infinite then you would naturally hear Man A first.