High-Speed Photography, Canon 850IS - General Help and Assistance on using CHDK stable releases - CHDK Forum
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High-Speed Photography, Canon 850IS

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Offline hbdp

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High-Speed Photography, Canon 850IS
« on: 14 / March / 2008, 00:03:28 »
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Hi - I'd love to replicate the results at Samples: High-Speed Shutter & Flash-Sync - CHDK Wiki, but there's not quite enough information for me.

I'm using the recent Allbest CHDK build on a Canon 850IS. 

The settings say "1/10,000 second, Manual mode, f/3.5, flash manual at lowest output, +4 diopter close-up lens, subject distance approx. 10 inches (25cm), room lights and lights above sink all turned on.".

... I see how to set the shutter override, however, I don't understand how to set the "flash manual at the lowest output" or explicitly set f/3.5 - at least on this model. Can anyone clarify for me how to do this, or if it's even possible with this model.
As far as I can see I can only indirectly set the f-stop and the flash is simply on/off.  Is this article using the in-built flash on the camera?

If not, I'd like a recommend on an inexpensive (even older) Canon camera that is able to do this.

Thanks, Steve
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Offline jetzt

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Re: High-Speed Photography, Canon 850IS
« Reply #1 on: 14 / March / 2008, 10:10:11 »
If flash is only on/off, you can't override it so far. (My A710 has already 3 flash steps without any chdk.)
But you can try to dim the flash somehow if you're getting overexposed images, for first tries some clear sticky tape should work, you can get it darker with first glueing it to some old cloth.
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Offline kole

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Re: High-Speed Photography, Canon 850IS
« Reply #2 on: 24 / March / 2008, 20:53:03 »
What about shooting Sun, with 1/10000 and F8?
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Re: High-Speed Photography, Canon 850IS
« Reply #3 on: 25 / March / 2008, 06:48:51 »
With a710 that also ends in big blackarea and an almost white bunch of pixels.
So you need a tripod and HDR I think.
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