English: The high-gain antenna dish was used to send the first high-res photos of the moon back to Earth. This is Serial Number 5.

Before Apollo, the U.S. flew robotic satellites around the moon with an ingenious analog film imaging system — long before digital cameras. The film was moved during exposure to compensate for the spacecraft velocity, which was estimated by an electro-optical sensor. The film had to be developed onboard the satellite in the onboard dark room (since the satellite would not return to Earth). The film was then raster scanned with a 6.5 micron beam and transmitted back to Earth with the dish antenna. (see diagrams on this in the comments below)

The Lunar Orbiter program consisted of five Lunar Orbiters which returned photography of 99% of the surface of the Moon (near and far side) with resolution down to 1 meter. Altogether the Orbiters returned 2180 high resolution and 882 medium resolution frames.

In the frame is a high resolution image recovered from Lunar Orbiter tape storage by Dennis Wingo in a pirate McDonalds at NASA Ames. It came from Lunar Orbiter IV in 1967, a full frame of 70mm film (details and annotations below).