Sound blimp
A sound blimp is a housing attached to a camera which reduces sounds, such as shutter click on SLR cameras, and motors on motion picture cameras. It is primarily used in film still photography, so as not to interfere with the shooting of principal photography, and also in other situations where sound is distracting: theatrical photography, surveillance, and wildlife photography.
It was invented by Irving Jacobson in the mid-1960s, and revolutionized film still photography by allowing stills to be taken during shooting, rather than after the fact.