Walker, Joe (1892–1985)

US cinematographer. He filmed many well-known films, in particular those of Frank Capra. He became an expert in optics and pioneered the zoom lens. In the early 1950s he retired to pursue his research and he invented the Elektra-Zoom, used on television cameras.

He was born in Denver, Colorado, and worked in Hollywood from the late 1910s. He began to get his first credits in the 1920s.