How To: Use film diffusion gels to change light beam shape

This video is geared toward filmmakers, specifically cinematographers and gaffers, on what diffusion gels are and when to use them on a film set. This is a part of The SubStream's "Film Lab".

Diffusion doesn't change the color of light, in general, although there are some colored diffusion gels. They only reduce the amount of light or the intensity of light as a side effect of what they're intended to change, which is the shape of the beam of light that's passing through it. There's a couple different types of diffusion gels, but the basic and most used ones are 1/16 white diffusion, 1/8 white diffusion, 1/4 white diffusion, 1/2 white diffusion, and full white diffusion.

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Previously, "How to use neutral density gels to change light intensity."