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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 10 Jun 2008 (Tuesday) 01:07
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Power of a 580 as a Master

 
bmynbr
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Location: Surrey BC Canada
     
Jun 10, 2008 01:07 |  #1

Ok so I have a 580exII on camera for fill as a master, and another as a slave. I know how to set the slave power, but don't know how much power the master is putting out.

I am sure I am missing something really basic, but couldn't find it in the manual.

Any info would be much appreaciated

Thanks, Dave


Canon 7d, 50 f1.8, Canon 17-85is usm, 58mm hoya cpl, 67mm b&w slim cpl, Manfrotto 190 tripod with 486rc2 ball head, Canon efs 10-22, 580exII, cybersyncs, Canon 70-200 f4L

http://www.treklens.co​m/members/BMYNBR/photo​s/ (external link)

  
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Pixel9ine
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Jun 10, 2008 01:54 |  #2

If your flash is on wireless E-TTL, you can set the A:B ratios on the master. So if you've set 1:4 as your ratio, your master will be set at 1/4th the power of the slave (note, this is not 1/4 power, but one-fourth of whatever the metered light output of your slave is going to be)

If you're shooting on manual wirelessly, then you can set the power output of your master and slave right on the master unit. Just keep the slave on E-TTL and the master will handle everything.

Other than that.... well, rtfm ;-)a


Andre B :: gearlist
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Power of a 580 as a Master
FORUMS General Gear Talk Flash and Studio Lighting 
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