Few marketing emails begin with the salutation, “hello friend of disposable film.” Welcome San Francisco’s recently founded Disposable Film Festival highlighting work captured on one-time use digital video cameras, webcams, point and shoot digital cameras, cell phones, screen capture software, and the like. The weekend-long  festival, art directed by interactive visual designer extraordinaire Rebecca Bortman, will include selections from the hundreds of submissions shot with non-professional video capturing equipment and will end with a panel about this new filmmaking phenomenon. In case you can’t make it to the screening of the New York film collective Red Bucket Films‘ feature “Buttons” on Friday (the trailer will have you tapping your toes until then), the competitive shorts program showcasing “the cream of the disposable-media crop” at the Roxie Theater is not to be missed.