Multiple light sources can be made to appear as one. Both create near shadowless light when used in large frames away from light. Tough White Diffusion and Grid Cloth are heavy diffusers. Sets can even be "tented or completely surrounded with diffusion to produce an extremely soft, shadowless quality that is particularly useful for product photography of specular objects like glassware, jewelry and automobiles. As overheads, diffusion can be placed above sets to deliver a soft, overcast look or used outdoors to diffuse harsh sunlight. Large diffusion panels can turn multiple lighting fixtures into a single source of soft, low contrast illumination. Each position produces a slightly different effect. The most important difference between atmospheric diffusion and Rosco's version is that the Rosco diffusion materials can be utilized to produce controllable and predictable results at any time.ĭiffusion material can be placed at the source in a gel holder, clipped to barn doors or positioned in front of a fixture in a frame. This softens the quality of the illumination by increasing the apparent beam size and thereby altering the beam's "shadow casting properties". When placed in the beam path of a lighting fixture, diffusion material modifies the harsh quality of the light by spreading or dispersing the beam. Rosco diffusion material acts in a similar fashion. The resulting light seems to be coming from the entire sky, producing an illumination that is softly diffuse. On an overcast day, water vapor in the cloud cover alters the harsh directional quality of sunlight by causing it to be spread out or dispersed. This is most notable when the subject is a person-facial features, age lines and wrinkles become more prominent. The hard shadows created by the point source nature of the fixture may be objectionable or unflattering to the subject.The beam field may be uneven in intensity.The resulting beam of light is directional, offering a high level of intensity or "punchy but it can also present a number of drawbacks: The reflectors in such fixtures gather the light into a point source and then focus it, usually through a lens. This same basic principle applies to most of the lighting equipment used in film and video production. In nature, the sun on a bright cloudless day is a good example of light from a single point source. Of course, these shadows are the areas where the light does not fall. When light from a point source shines on a three dimensional object, shadows are created.
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