Flash question - how is power reduced?

Started May 22, 2012 | Discussions thread
Joseph S Wisniewski Forum Pro • Posts: 34,130
stop really fast action. Yes?

Dr. Leonard wrote:

rightwinger wrote:

Its a shorter flash duration......

So if you string a bunch of flashes together, you can get enough light and of short duration to stop really fast action. Yes?

That depends entirely on your definition of "really fast action".

I use up to 8 speedlights routinely for high-speed stuff, typically involving shattering glass. At 1/128 power, duration is around 1/30,000 sec (30 microseconds) and the glass mostly is frozen, although pieces that get "caught up" in the momentum of the pellet are blurred. Pellet-gun pellets at full speed are totally blurred. Small, liquid objects (fruit, peppers, etc) produce blurred spray.

If the fast action involves humans, you're fine. Humans don't do much that isn't frozen at 1/8,000 sec, and you can freeze them sharp with speedlights at 1/32 power, or an Einstein or two at a similar setting.

-- hide signature --

Rahon Klavanian 1912-2008.

Armenian genocide survivor, amazing cook, scrabble master, and loving grandmother. You will be missed.

Ciao! Joseph


 Joseph S Wisniewski's gear list:Joseph S Wisniewski's gear list
Canon EOS 5D Mark II Nikon D90 Nikon D2X Nikon D3 Nikon D100 +43 more
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow