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John Hannon |
13:16 8 Nov 07 |
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Jorge Gasteazoro. |
19:05 8 Nov 07 |
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Ben Wilbur |
15:13 8 Nov 07 |
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Don Bryant |
19:22 25 Dec 07 |
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Jorge Gasteazoro. |
20:19 25 Dec 07 |
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Don Bryant |
16:15 27 Dec 07 |
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Re: Using a flash for testing. |
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Barry Wilkinson |
3:03 28 Dec 07 |
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If my ramblings are too off topic, please delete them Mods.
I'm sure that the flash output could be made adjustable. How repeatable could only be found by experiment. Unfortunately I don't have access to the electronic lab equipment I once had to try this.
As I understand it, the flash circuitry charges a capacitor to a pre-defined level. The stored energy in the capacitor is then 'dumped' into the flash tube. I assume that this energy can be adjusted by altering the charge level or the time to discharge the capacitor?
I have been considering making a 'film exposure box' but using tri-colour LED's instead of flash. I understand that the output of these can be controlled using Pulse Width Modulation techniques. Chips are available for this purpose.
Using flash or LED's still has leaves the problem of getting even illumination across the exposure surface. I am considering using the same kind of light mixer that my enlarger uses. This is a simple box lined with polystyrene. This would sit below a perspex diffuser. Any idea's welcomed. I think this would work equally well with flash or LED's?
Any electronics persons out there?
Barry |
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Steve Nicholls |
15:59 28 Dec 07 |
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Barry Wilkinson |
2:11 29 Dec 07 |
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Steve Nicholls |
2:49 29 Dec 07 |
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