Softbox Size & Light Placement Tool
Start with your own readings. Calculate the change, verify a frame, and save what works.
Size & placement
Compare apparent source size and lighting geometry.
Compare softbox size, distance and portrait light direction
A larger source relative to the subject generally creates broader shadow transitions. Compare apparent angular size for two setups, then explore side angle, elevation and grid coverage.
- Enter each modifier’s luminous size and subject distance in one consistent unit.
- Compare apparent source size and inspect the direction diagram.
- Evaluate catchlights, nose shadows and spill in a real test frame.
A three-foot luminous source at three feet subtends approximately 53°. The same source at six feet subtends approximately 28°. The nearer source has a larger apparent size, but coverage and falloff change too.
Does the tool simulate the light on a face?
No. It shows geometry and coaching prompts. Diffusion, reflectance, bounce and the actual luminous area influence the photograph.
What should I check when raising the light?
Check eye sockets, catchlights and nose shadows. Refine the placement for the face rather than treating one elevation as universally correct.
Learn the decision behind the setting.
By Dwayne of DNA Premium Portraits, Sacramento-area portrait photographer. See formulas, assumptions and equipment sources.
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