Sekonic L-398 Operating Instructions Manual
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Sekonic L-398 Operating Instructions Manual

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Questions and answers

Michael Bogue
April 19, 2025

Determine lighting ratio

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1 comments:
Mr. Anderson
May 10, 2025

To determine the lighting ratio using the Sekonic L-398:

1. Measure Main Light:
- Mount the Lumigrid on the light sensor.
- Point it directly at the area lit by the main light.
- Read the footcandle value. Example: 640 footcandles.

2. Measure Fill Light:
- Keep the Lumigrid mounted.
- Point it toward the area lit by the fill light.
- Read the footcandle value. Example: 320 footcandles.

3. Calculate Lighting Ratio:
- Divide the main light value by the fill light value.
- Example: 640 ÷ 320 = 2:1 lighting ratio.

This gives you the contrast ratio between the main and fill light.

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