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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 01 Nov 2011 (Tuesday) 09:37
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Speedlite 580exII and 7D question

 
mike21951
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Nov 01, 2011 09:37 |  #1

Hi,

I may be missing something obvious.....

I know the 7D can wirelessly fire the speedlite. What I'm trying to figure out is if the 7D can fire the speedlite without the on camera flash firing. It seems like no matter how I set it, both the speedlite and the on camera flash fire. In the flash control menu, I select built-in function setting, then wireless function. I then select the icon for the speedlite only. Seems like it should work...but it doesn't. They both always fire.

Any suggestions?

Thanks,
Mike




  
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dedsen
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Nov 01, 2011 09:58 |  #2

What you are missing is this line in the 7d Owner's manual.

The slave unit is controlled by the built-in flash's light pulse signal.

Bottom of page 121.

The control is from the flash. The popup fires flashes of light just before the exposure. Contrary to popular belief, there is no radio station inside of your camera. :)



  
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GeeMack
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Nov 01, 2011 10:02 |  #3

What you are seeing from the internal camera flash is the pre-flash that communicates with the remote. This light occurs before the shutter opens and will not affect the picture.


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digital ­ paradise
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Nov 01, 2011 10:28 |  #4

You can set it up so it just emits a small amount of light to communicate with the flash. This way the onboard flash will not effect the image.


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mike21951
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Nov 01, 2011 10:35 |  #5

OK. It must be the pre-flash that I'm seeing. I'll play around with the ratios to make sure it isn't effecting the image.

Thanks for the help.

Mike




  
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dedsen
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Nov 01, 2011 11:24 |  #6

digital paradise wrote in post #13337224 (external link)
You can set it up so it just emits a small amount of light to communicate with the flash. This way the onboard flash will not effect the image.

Where are you getting your info that you can adjust the intensity of the pre-flash? I am not saying it cannot be done. I just have never seen anything that says you can or how to do it.



  
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GeeMack
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Nov 01, 2011 11:32 |  #7

It's fairly easy to see the pre-flash if you set your camera for 2nd curtain sync and use a 2 second shutter speed. You will see the pre-flash and then the shutter will open (you may not be able to distinguish these two actions) and then 2 seconds later the exposure flash will go off.


7D, 50 f1.8, 17-55 f2.8, 70-200 f2.8 II, 100-400 f4.5-5.6L, 2x TC III, 580EX II, 430EX, 568EX II, 622C
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digital ­ paradise
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Nov 01, 2011 12:38 |  #8

GeeMack wrote in post #13337462 (external link)
It's fairly easy to see the pre-flash if you set your camera for 2nd curtain sync and use a 2 second shutter speed. You will see the pre-flash and then the shutter will open (you may not be able to distinguish these two actions) and then 2 seconds later the exposure flash will go off.

Minute 1:30

http://www.youtube.com​/watch?v=Sna5GUmbX2A (external link)


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dedsen
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Nov 01, 2011 13:43 |  #9

I know that you can set the popup to only fire the instruction flashes. I guess I misunderstood you and though that you were also claiming that you could turn down the power of the instruction flashes.
My bad.



  
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digital ­ paradise
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Nov 01, 2011 15:30 |  #10

No problem. I guess the only other way would be by ratio but probably not the best option.


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msowsun
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Nov 01, 2011 20:29 |  #11

While in wireless mode, in addition to the preflash that fires before the shutter opens, there is also a flash from the "popup" that occurs while the shutter is open. This happens even if the "master" is set so that it does not contribute light to the photo. 'You can see this if you take a photo looking into a mirror.

I first noticed this when taking off camera Macro shots at very close range, and then confirmed it in the mirror.


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tygrtx@gmail.com
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Nov 01, 2011 20:39 |  #12

Learned something about my 7D from this .THANKS




  
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Speedlite 580exII and 7D question
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