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I have a Canon 430EX flash and an iPhone 5. I really enjoy the quality of the camera in daylight, but of course in low light conditions the built in LED flash is quite poor. So would it be possible to use an off camera flash such as the one I have to provide additional light for the camera? I would prefer to use this in practice and not just for theoretical purposes.

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3 Answers 3

You can use an optical trigger app in your iPhone. This reverses the roles, the iPhone takes a picture when you fire your flash.

The one app I know that does this is iSyncFlash.

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Unless I'm missing something, this couldn't possibly work. –  junkyardsparkle Feb 20 at 22:53
    
It must be recording a loop of underexposed video, then extracting a bright frame... the image quality must be... interesting. –  junkyardsparkle Feb 20 at 23:08

I know with the 430ex II I can set it to manual and wireless and the flash from the camera will trigger the speedlite. Just give it a shot.

Here's a video where one of the cheapest cameras was used with a 430ex II: http://www.youtube.com/watch?v=zh6zr3wKRV0

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Very nice link @tenmiles. My brother used to have that p&s.... –  Francesco Oct 7 '12 at 8:42
    
Do we know what settings he used on the 430 EX II for this? I have that flash and an iphone, and am very interested!!! :) –  Mike Oct 9 '12 at 9:03
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I don't think it will work with the iPhone, though, because it has an LED rather than a proper flash. –  mattdm Oct 12 '12 at 2:45
    
@mattdm - You are correct. There are two issues with this answer. First of all the 430EX does not have an optical sensor(unlike the Nikon flash used in the video linked to). And secondly all of the smart phones I have tested do not seem to trigger flashes optically. What exactly the reason is for that I'm not sure but in any case it doesn't work. –  dpollitt May 29 '14 at 3:23
    
If there's some consistency in the time between when a phone turns on it's LED "flash" and when the exposure happens, it seems like you could design a sensor with an adjustable lag and tune it by trial-and-error... but you would still have to be able to tell the camera not to crank up ISO somehow. –  junkyardsparkle Feb 20 at 23:13

The iSyncFlash app is supposed to do this, by syncing the iPhone's camera to the flash, rather than the other way around (although the current reviews of the app indicates it doesn't work much on phones newer than a 4s). And you may be able to accomplish this with TriggerTrap Mobile, two Android/iOS devices, and a flash adapter; TriggerTrap Mobile uses the headphone jack for the sync signal.

See: http://www.thephoblographer.com/2014/12/05/shooting-strobist-style-shooting-phone/

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