Size of the light-emitting surface determines hardness and spread — smaller softboxes produce harder shadows.
Definition
The softbox size determines light quality and shadow characteristics in film production. Larger softboxes produce softer light, smaller ones harder shadows.
Practical Application
Various softbox sizes for specific tasks:
- 60x90cm: Portrait shots, single subjects
- 100x100cm: Group shots, larger areas
- 150x200cm: Full body shots, background illumination
- Striplight 30x120cm: Edge light, hair light
Technical Details
Important parameters:
- Light output: Larger softboxes reduce light loss by 0.5-1 stop
- Shadow hardness: 1:3 ratio between softbox size and subject distance for soft shadows
- Beam angle: Varies from 45° (small) to 120° (large softboxes)
- Setup time: 2-5 minutes depending on size and system
Practical Tips
- Softbox diameter should be at least 1/3 of the subject size
- Distance to the softbox determines light falloff: Double the distance = 2 stops less
- Measure exposure on the subject, not the softbox
- Transport: Collapsible systems for location shoots, fixed for studio work
Professional Standards
Standard sizes in production:
- Compatibility with common lamp systems (Bowens, Elinchrom)
- Quick-release systems for setup changes
- Consistent color temperature through diffusion material
- Documentation of used sizes for continuity shots
More in the lexikon