Carl Zeiss Planar 50mm f/0.7

The Carl Zeiss Planar 50mm  is one of the largest relative aperture (fastest) lenses in the history of photography. The lens was designed and made specifically for the NASA Apollo lunar program to capture the far side of the Moon in 1966.

Stanley Kubrick used these lenses when shooting his film Barry Lyndon, which allowed him to shoot scenes lit only by candlelight.

In total there were only 10 lenses made. One was kept by Carl Zeiss, six were sold to NASA, and three were sold to Kubrick.