450D & 580EX II off 12V battery

Started Oct 15, 2008 | Discussions
DerekN
New MemberPosts: 12
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450D & 580EX II off 12V battery
Oct 15, 2008

Two questions:

What adaptors and cables would I need to connect two Canon 580EX II flashes to a 450D. The two flashes must both be controlled by the 450D.

Is it possible to run the above arrangement off a 12V car battery? It is at a remote site with only 12V available. If possible, how do I go about this?

Thanks.

Derek

tkbslc
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Re: 450D & 580EX II off 12V battery
In reply to DerekN, Oct 15, 2008

Probably the easiest way would be to use car charger to charge up batteries for all the devices. Should be pretty easy. I imagine you could use 12V to power them directly, but that would require a pretty complex series of inverters and adapters. Depending on how remote you are going, you could get the battery grip for your camera that takes AA batteries. Then you could just bring a big box of high quality AA batteries to last you the whole time.

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thanos
Regular MemberPosts: 300
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Re: 450D & 580EX II off 12V battery
In reply to DerekN, Oct 15, 2008

DerekN wrote:

What adaptors and cables would I need to connect two Canon 580EX II
flashes to a 450D. The two flashes must both be controlled by the
450D.

You will need nothing more. You can put one flash on the camera and set it in Master mode and the other on a tripod in Slave Mode. From your camera you can control the A/B ratios of the two flashes. Start reading here: http://photonotes.org/articles/eos-flash/

But, if you want both flashes off camera and don't care about eTTL then you'll need a hotshoe to PC sync adapter like this one:
http://www.gadgetinfinity.com/product.php?productid=16727
and use cables like these:
http://www.gadgetinfinity.com/product.php?productid=16840&cat=0&page=1
to connect from camera to flash.
In that case start reading http://www.strobist.com

Alternatively to use both flashes off camera in eTTL mode you'll need the Canon Speedlite Transmitter ST-E2 (pricey). Check photonotes.org above for details.

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DerekN
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Re: 450D & 580EX II off 12V battery
In reply to thanos, Oct 21, 2008

Thanks for the info.

What is the external DC voltage limit of the Canon 580EX II SpeedLite? It has four internal batteries (6V). I've seen external battery packs with six batteries (9V?). I've also seen DC battery packs stating "high voltage".

Would I be able to leave out the four internal batteries and supply the 580EX II with 12V DC through its external power socket. I can't seem to find a upper voltage spec for this input.

Thanks in advance.

Derek

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