ImageReasonLighting, Flash, and Studio
How much longer is my bounce path than a direct shot?
Enter your direct distance and two-segment bounce path to see the path-length comparison, a planning ratio, not a bounce exposure or power prediction.
Answer
Calculate a result to see surface and path-length flags.
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Explore results
Calculate to see the direct and bounce rays.
| Scenario | Path | Ratio |
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Calculate a result to generate a copyable plan.
A planning comparison, not a power answer
Bounce flash adds a path and a surface between the flash and subject. A longer path generally demands more from the flash, but the surface's size, colour, reflectance, angle, and surrounding room can dominate the result. Treat path length as a planning comparison, then make a real direct-versus-bounce test.
A three-metre direct path compared with a two-metre flash-to-wall plus three-metre wall-to-subject path creates a five-metre bounce path, about 1.67 times longer. The path-length-only comparison is roughly 1.47 stops lower before surface behaviour. A white wall and a dark coloured ceiling are not equivalent reflectors. Test the actual setup and inspect both exposure and colour.
This result models the values you entered. It cannot see the scene, verify focus or movement, predict camera-specific processing, or guarantee the final photograph. Use it as a stated starting point, then check the important subject area in a test frame or proof.
Make one controlled test with the important variable held constant. Inspect the subject detail, motion, highlights, and intended output, then adjust the setting that protects the priority you named.
FAQ
- Can this tell me how much flash power to use for bounce?
- No. Surface behaviour and flash/lens conditions are too variable. The page plans a test rather than a power prescription.
- Is this a guarantee?
- No. The result is bounded by the inputs and assumptions shown on the page. It is designed to support a better next decision, not replace a test, measurement, proof, or professional judgement where one is needed.