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- CommentAuthorTeguh
- CommentTimeFeb 19th 2010
I make an experiment of High Speed Sync using 580EXII (as master) and 550EX (as slave) and I experience a decreasing power of speedlight in shutter speed above 250.
I set a full power of slave speedlight and set master un-flash. Distant of an Object to flash is arrond 6 feet.
In shutter speed 400 I had coorect exposure, but in 1600 shutterspeed I had an under exposure image,
(I used f/2.8 for all images)
can anyone share why this happend and how to get a full power of speedlight in High speed sync ???
Sincerely.... Teguh - indonesia -
- CommentAuthorRussell
- CommentTimeFeb 20th 2010
I'm afraid our poor flash units or studio lights are limited to the slowness of light speed. Sounds strange calling it slow but compared to our cameras it is. My studio lights have a syn speed of up to 1/250 before you get the black curtain effect where the shutter's closing before all the light has had enough time to do it's thing. Sorry friend but limitations of physics. A lot of flashes will pulse light out on some settings and I'm sure this could be used to some effect to help but it eats your batteries like there's no tomorrow.
Hope that helps a bit.
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