On Wikipedia page on Moon landing, Neil Armstrong is shown stepping down on the surface of the Moon using the spaceship's ladder:
Still frame from a video transmission, taken moments before Neil Armstrong became the first human to step onto the surface of the Moon, at 02:56 UTC on 21 July 1969. An estimated 500 million people worldwide watched this event, the largest television audience for a live broadcast at that time. (Photograph and caption source: Wikipedia on Moon landing)
The camera is installed outside the spaceship, on the Moon's surface. Who put the camera there?