Defocusing moves the focal point of a lens away from the target surface, causing the projected image or beam edge to blur. In theatrical lighting, designers frequently defocus a fixture to soften the edge of a beam, helping it blend smoothly with adjacent lights. It is achieved by physically moving the lens tube forward or backward relative to the light source.
Heard on the job
Defocus that profile slightly so the hard edge doesn't cut right across the presenter's face.
Also heard as
- soften
- run the barrel
Do not mix it up with
- Focus: Focus brings a beam into a sharp, hard edge, while defocus intentionally softens and blurs that edge.
Related terms
Focus
The point where light rays converge to form a sharp image, or the state of being sharply defined.
Focal point
The specific point in space where collimated light rays converge after passing through a lens.
Wash
Broad, even light covering a whole stage area or surface, built from overlapping soft-edged fixtures.