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Making the flash flash multiple flashes

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Offline LjL

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Making the flash flash multiple flashes
« on: 26 / July / 2008, 08:49:24 »
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Excuse the subject ::) And please move this to "Feature requests" if you deem it's more appropriate for there, I'm not sure.

I'd like to fire the flash multiple times during a single exposure. I sure realize it just can't be done at anywhere near full power without long recharge times, but given the camera does fire a pre-flash, and a few posts in DataGhost's thread hint to the possibility, I'd like to know how that's done - on an A720, if at all possible.

I was thinking it could be useful for semi-scientific things that involve measuring the velocity of an object; I think that ought to be possible by taking a long enough exposure and firing the flash at the beginning and at the end, for example.

Also, my camera sports a terrible red-eye effect, and I wonder whether firing a couple more pre-flashes (at the expense of a weaker final flash) would mitigate this, since it seems it's the trick that most other cameras use to achieve this.

Re: Making the flash flash multiple flashes
« Reply #1 on: 02 / February / 2010, 16:07:55 »
I would like to use sevral flashes (2 or 3 at less) in one picture...
Do you find the way to do that???
thx
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S90

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Offline fudgey

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Re: Making the flash flash multiple flashes
« Reply #2 on: 02 / February / 2010, 17:11:41 »
Umm... I guess ewavr's recent post has something to do with firing flashes at will using the new eventproc interface:
http://chdk.setepontos.com/index.php/topic,4417.msg45895.html#msg45895

But be cautious calling event procedures whose meaning you don't understand...there are ways to harm the camera and misusing the flash could potentially be one.

Re: Making the flash flash multiple flashes
« Reply #3 on: 02 / February / 2010, 21:05:55 »
thx for the answer!
With what i can read on the forum, i see that it could be dangerous for the camera to misuse the flash.(in continuous mode with flash, there's pictures every 1 or 2 sec and you can take a lot of pictures...) But i think (i'm not an informatician) that is reasonable to fire the flash two times in a 3 sec exposure shot. I don't know what it means for the code, and the difficulty to make the script...I just think that ther many creative ways to use that kind of script.
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Re: Making the flash flash multiple flashes
« Reply #4 on: 16 / July / 2010, 02:34:27 »
I was interested in this as well for more creative shots in the dark. it looks like i have a solution by merging multiple exposures in computer software. Unfortunately, that won't help the more practical goal the OP had in mind

 

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