Cinematography Tutorial: Flags are pieces of black duvetyne held together by metal frames. Flags are generally held up by c-stands in an effort to cut or shape light and provide "negative fill".
It's important to mention that when using c-stands you should first position your flag exactly as you want it with the c-stand joints loose. Then when your flag is ready, tighten the c-stand joints in order to secure the precise position of the flag. This will not only help you precisely establish where your shadows will fall, but it will also save you a lot of time during your setup.
Many independent filmmakers rather than using black fabric flags and c-stands, will instead use tripods, clamps and black foam core. A large piece of black foam core can be purchased from an art supply store for around $10-$15 and it will have essentially the same impact. In fact, virtually any opaque object can be used to flag light.... continue reading on our blog.
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