SDMB cinematographers: Why the silk?

My friend noticed something on a couple of ‘making of’ DVD extras. I haven’t seen them myself, so I’ll describe this as well as I can.

Someone is holding a black silk over the camera. He first described that the silk was being held behind the camera, though he later said that the silk would also be held over the front. I can see why the silk would be over the front. If the French flag would get in the frame, then holding a silk higher and farther out would shade the sun from hitting the glass. But what about holding it behind the camera? What does this do? I imagine that it would keep direct light out of the eyepiece, but the operator is closing that off with his eye and there should be a shutter in it to close off the opening when he removes his eye from it and pressure is released. My friend suggested that it would break up the camera’s shadow, but I would not frame the shot such that the shadow would be a factor.

So what’s up with the silk?

I thought you were the SDMB cinematographer. I think we need a bit more info. The french flag bit confused me too. What movies are you talking about? Maybe somone has one of them. Maybe it’s just to shade the camera from getting overheated in the sun.

I work on films with budgets so low, it’s lucky if we have a camera!

A French flad is a plate, usually of metal, that is on an articulated arm that can be adjusted to exclude unwanted light from the lens.

I don’t know which film he saw it on. He watches a lot of films.