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Robert S. Sfeir |
6:39 29 Nov 03 |
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Phil Davis |
7:01 29 Nov 03 |
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Robert S. Sfeir |
7:19 29 Nov 03 |
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Phil Davis |
17:43 29 Nov 03 |
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Robert S. Sfeir |
7:39 30 Nov 03 |
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Phil Davis |
9:04 30 Nov 03 |
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Phil Davis |
11:37 30 Nov 03 |
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Robert S. Sfeir |
13:36 30 Nov 03 |
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Ron Jasinski |
21:55 18 Nov 03 |
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Re: Using flash with BTZS |
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Phil Davis |
7:32 19 Nov 03 |
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Ron --
You have to use BTZS "manually" with flash; that is, you can't use either the Expo/Dev program or the PowerDial because there isn't any real "shutter speed" with flash (exposure time depends on flash duration).
So you have to open the Plotter program, run the file of the film/developer you plan to use, using the ES of the paper you like to print on, then print out the EFS/SBR and Dev/SBR charts. Then DOUBLE the film speed numbers on the EFS/SBR chart.
This is essential because you'll be basing exposure on the shadow reading and that's not the way the incident meter is intended to be used. This is necessary ONLY when using this manual method; when you use either the Expo/Dev or PowerDial that speed adjustment is taken care of in the design of these aids.
Here's a summary of the procedure:
• Meter the highlight area (pop the flash to get the reading)
• Meter the shadow area
• Subtract the low reading from the high (in stops) and add 5; that's the SBR
• Consult your EFS/SBR chart to find the DOUBLED film speed
• Set this DOUBLED film speed into the meter
• Re-read the shadow area using this new DOUBLED speed
• Use the recommended aperture and shoot
• Consult the Dev/SBR chart to find the developing time.
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