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David Mark |
9:12 15 Jan 03 |
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Phil |
12:26 15 Jan 03 |
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David Mark |
8:05 16 Jan 03 |
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Phil |
9:01 16 Jan 03 |
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Michael Mutmansky |
8:58 13 Jan 03 |
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Re: Workaround for low light levels? |
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Phil |
12:26 13 Jan 03 |
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Michael --
The current version of the Palm ExpoDev will accept EVs down to, and including, EV-3 so you should be able to use it under most conditions. Materials files included with the current program version also include improved reciprocity compensation so the program generally works very well for night photography. Incidentally, ExpoDev will also accept "Lo" values that are higher then the "Hi" values and provide useful working information for very flat scenes — assuming that your chosen materials are capable capable of producing the necessary high average gradients. Check with Fred (fred@viewcamerastore.com) to upgrade your program.
It's not practical to use ExpoDev for flash because you have no control of the exposure time, but you can use the Incident metering method and refer to the Plotter EFS/SBR and Dev/SBR charts for EFS and development information. Here's the procedure:
> Arrange your light setup; hold the meter in the shadow area and pop a flash to get an aperture reading.
> Pop the flash again with the meter in the highlight area to get a second aperture
> Calculate the difference between the two readings, in stops, and add to 5 to get the SBR
> Find the EFS for that SBR (from the Plotter chart) and DOUBLE IT!
> Set this DOUBLED EFS into the meter instead of the ISO value
> Pop a shadow reading again, and use this new aperture to make the exposure
> Consult the Dev/SBR chart for the developing time.
Bill Waldron has been doing some portraits using this general technique. I expect he'd be willing to share his experience with you if you're interested.
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Michael Mutmansky |
9:43 15 Jan 03 |
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howard schwartz |
7:39 12 Jan 03 |
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Phil |
9:03 12 Jan 03 |
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David Mark |
13:46 10 Jan 03 |
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