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Old Dec 21, 2007, 11:28 AM   #1
ddd
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Anybody have ideas how to interface the USB socket of the S3 to trigger an external flash (420EX is what I have)? Any CHDK scripts out there to enable the flash through a remote (USB) switch? Any units that detect the S3 flash and trigger an external flash? Tnx for any input.


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Old Dec 28, 2007, 9:09 AM   #2
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I really don't know about using the USB port. You might find this discussion helpful, a digital optical slave would be a lot easier than hacking your camera to run scripts for the USB / Flash combo:

http://photography-on-the.net/forum/...d.php?t=266154




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Old Jan 2, 2008, 11:42 PM   #3
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You might want to look at the Canon HF-DC1, a slave flash that gets triggered by the built-in flash of the camera.
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Old Jan 6, 2008, 6:01 PM   #4
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The Canon HF-DC-1 is not very powerful. In terms of Slave Flashes, I have had the best successes with the Bower SFDS model. It is small and convenient measuring about 2" wide by 3" tall. It has a good acceptance angle and uses 2 NiMH batteries.

Here is a photo sample. It was taken with a telephoto 150mm lens on an Olympus E-300. The E-300 camera is handy because the camer's built-in flash can be deployed at the same time the Bower Slave Flash is mounted on the camera's hot shoe. Together those two flashes are about the strength/power of the Olympus Fl-36 external flash.

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Old Jan 6, 2008, 6:04 PM   #5
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That photo shows the camera set-up. Here is the photo that I took with that camera set-up at a distance of 35 feet, using an ISO setting of 800.

Sarah Joyce


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Old Jan 6, 2008, 6:44 PM   #6
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Here is another sample of a stand back photo using an ultra zoom and a slave flash. In this case it was a Sony H-5 with the camera's built-in flash and the Bower SFD 328 from a distance of 25 feet.

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Old Jan 7, 2008, 2:39 AM   #7
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Does the Bower work off the reflected light of the onboard flash or off the hot shoe trigger?

As you know, the S3 does not have a hot shoe.

The Bower looks like a nice sized flash for even hot shoe use like on an S5.
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Old Jan 7, 2008, 11:10 AM   #8
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a-beginner-

The Bower SFDS fires based on the emmitted light of the camera's on board flash. It does not fire through any hotshoe electrical contacts.

Sarah Joyce
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Old Jan 7, 2008, 10:17 PM   #9
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Sarah,

Thanks a lot. The Bower sure sounds like a winner for those who don't have a hot shoe but want external flash.

You are right - the Canon HF-DC1 (which I have) is not a powerful slave.

I might just look at the Bower. Would you have the website where it can be ordered?

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Old Jan 8, 2008, 5:39 PM   #10
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a-beginner-

I saw it recently on Beach Camera's website.

Sarah Joyce
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