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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 23 Feb 2010 (Tuesday) 15:56
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Off-camera High Speed Sync

 
charl1e
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Feb 23, 2010 15:56 |  #1

Hey guys, I am venturing into the high speed OCF world, and I am still a bit confused as to how you achieve HSS with multiple wireless flashes.

As of now, I am thinking of buying a 550ex as a master, and then maybe a 430ex off camera as slave. Would this setup work for outdoor shoots in HSS?

Also, is there any way I can use my Vivitar 285HV's with optical receivers as slaves with the 550ex in HSS?


Canon 5D Mark III, 35mm f1.4L, 70-200mm f2.8L, 50mm f1.4, 85mm f1.8, 50mm f1.8, Sigma 24-35mm f2 ART
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PacAce
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Feb 23, 2010 16:41 |  #2

Yes, HSS will work outdoors with your flashes set up in an E-TTL wireless configuration. However, you'll have two things going against you right off the bat so your working distance is going to be limited to some degree. First of all, under bright sun light, the master will be competing with the sun so its lower powered command flashes may not be as visible to the slaves unless they are close to the master. If the sun is in front of the slave and the sunlight falling on slave's IR sensor, the sun will cause a glare that makes it difficult for the slave to "see" the command flash from the master at longer master to slave distances.

Then there's the fact that, when in HSS mode, the output of the flash is reduced by an amount which depends on the shutter speed used. You'll lose two stops of light as soon as the flash is switched to HSS mode. And then you'll lose an additional stop of light for every stop above the max sync speed you set the shutter speed. For example, if you set the shutter speed to 1/500, you'll lose about 3 stops of light compared to shooting in normal (non-HSS) mode. At 1/1000, you'll lose 4 stops of light.

So just be sure to take these things into account when setting up the flashes outdoors in an E-TTL wireless configuration.


...Leo

  
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PacAce
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Feb 23, 2010 16:44 |  #3

charl1e wrote in post #9667653 (external link)
Hey guys, I am venturing into the high speed OCF world, and I am still a bit confused as to how you achieve HSS with multiple wireless flashes.

As of now, I am thinking of buying a 550ex as a master, and then maybe a 430ex off camera as slave. Would this setup work for outdoor shoots in HSS?

Also, is there any way I can use my Vivitar 285HV's with optical receivers as slaves with the 550ex in HSS?

It's never a good idea to mix regular optical slaves in an E-TTL wireless configuration because it never works right. The optical slaves will never fire in sync with the camera and when they do go off, they usually mess up the master command signal enough that the EX slaves won't fire.


...Leo

  
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Off-camera High Speed Sync
FORUMS General Gear Talk Flash and Studio Lighting 
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