Wide Field and Planetary Camera
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The Wide Field and Planetary Camera (WFPC) was a camera installed on the Hubble Space Telescope. It was one of the instruments on Hubble at launch, but its functionality was severely impaired by the defects of the main mirror optics which afflicted the telescope.
As part of the corrective service mission (STS-61 in December 1993) the WFPC was swapped out for a replacement version. The Wide Field and Planetary Camera 2 improved on its predecessor and incorporated corrective optics needed to overcome the main mirror defect.
WFPC2 was itself to be replaced by the Wide Field Camera 3 which has been under construction since 1997. It was originally due to be installed using the space shuttle during SM4 (service mission #4). However in January 2004 this mission was cancelled, and there is now no certainty that the new camera will ever be deployed on Hubble.