Exposure determination; sun on the side, fill flash for the shadows

Started Oct 3, 2011 | Discussions thread
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hzmeyer
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Exposure determination; sun on the side, fill flash for the shadows
Oct 3, 2011

The setting: the subject is standing in the sun with pretty scenery in the background. To get the proper composition, the sun will cast deep shadows on the side of the subjects face

Using the camera meter, I can determine the exposure from the sun on the front of the face; using the flash guide number and subject to flash distance, I can determine the flash setting. Reducing it by two stops I can add detail to the shadow area.

What I find confusing is how much will the flash ADD to the metered exposure on the sunny side of the face? Is there a way to calculate that or is an educated guess required? Or can I just ignore it? The plan was to have the flash no more than 10 feet from the subject.

To make it more interesting, replace the sun with a much less intense flood light.

This is a hypothetical situation but I have to present it as a primer at our next camera club meeting.

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