I am looking to add a couple more Canon flashes to my setup. My plan is to use my 550ex as the master and the additional units as a slave. My question; can I use the 550ex to fire the additional flashes without firing the one on the camera?
10range Member 165 posts Joined Jun 2007 Location: North Central Indiana More info | Jun 27, 2009 12:46 | #1 I am looking to add a couple more Canon flashes to my setup. My plan is to use my 550ex as the master and the additional units as a slave. My question; can I use the 550ex to fire the additional flashes without firing the one on the camera? Gear list: Canon 20D, Canon 17-55IS, Sigma 70-200 F2.8, Canon EF 50/1.8, Speedlite 550EX
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Jun 28, 2009 04:52 | #2 I don't know enough to say for sure. But I heard you can shut off the flash but still use it as a master. Anyway, wouldn't the manual say something about this?
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CliveyBoy R.I.P. He will be missed  3,272 posts Likes: 42 Joined Nov 2005 Location: Tauranga, NZ More info | Jun 28, 2009 04:58 | #3 Yes, you can. Clive, and Great G/D Abbie
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Thanks for the info. Gear list: Canon 20D, Canon 17-55IS, Sigma 70-200 F2.8, Canon EF 50/1.8, Speedlite 550EX
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District_History_Fan Goldmember 2,286 posts Likes: 1 Joined Dec 2008 More info | Jun 28, 2009 11:19 | #5 CliveyBoy wrote in post #8188142  Yes, you can. Cycle through the Sel/Set button presses until the Master Flash icon appears. Set Master Flash On or OFF using the + and - buttons. Correct!
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apersson850 Cream of the Crop  More info | There will still be a flash, to control the other slaves, but it will be of low power, and not affect exposure, unless the master is very close to the subject. Anders
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bobbyz Cream of the Crop 20,506 posts Likes: 3479 Joined Nov 2007 Location: Bay Area, CA More info | Jun 28, 2009 14:15 | #7 apersson850 wrote in post #8189419 There will still be a flash, to control the other slaves, but it will be of low power, and not affect exposure, unless the master is very close to the subject. Wouldn't the master/slave communication happen before the actual shot is taken? Fuji XT-1, 18-55mm
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CliveyBoy R.I.P. He will be missed 3,272 posts Likes: 42 Joined Nov 2005 Location: Tauranga, NZ More info | Jun 28, 2009 18:23 | #8 bobbyz wrote in post #8189879 Wouldn't the master/slave communication happen before the actual shot is taken? Yes and no! Clive, and Great G/D Abbie
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apersson850 Cream of the Crop More info | Yes, that's how it works. I wasn't sure if they (Canon) managed to send the trigger flash just before the event, to prevent the master flash from any impact at all, as far as the picture goes, so I did a test. By taking a photo, where the reflectors of both slaves and master was visible in a mirror, I could see that the master's flash was visible, regardless of whether it was set to "off" or "on". But it was significantly more powerful when set to "on". This operation will normally not affect the correct exposure of the subject, although the exposure might be affected if the subject is close and a high ISO sensitivity has been set. To limit this effect as much as possible, bounce the light by tilting or rotating the SB-900’s flash head. If someone thinks it's inappropriate to quote a single paragraph from Nikon's SB-900 user's manual, then let me know or remove it yourself, if you can. Anders
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