TheFaint Object Camera (FOC) was acamera installed on theHubble Space Telescope from launch in 1990 until 2002. It was replaced by theAdvanced Camera for Surveys. In December 1993, Hubble's vision was corrected on STS-61 by installing COSTAR, which corrected the problem with Hubble's mirror before it reached an instrument like FOC. Later instruments had this correction built in, which is why it was possible to later remove COSTAR itself and replace it with a new science instrument.

The camera was built byDornier GmbH and was funded by theEuropean Space Agency. The unit actually consists of two complete and independent camera systems designed to provide extremely high resolution, exceeding 0.05arcseconds. It is designed to view very faint UV and optical light from 115 to 650 nanometers in wavelength.^[1] FOC has been compared to a "telephoto" lens, providing a high resolution in a small field of view.^[2] FOC could distinguish between two points 0.05arc-seconds apart.^[2]

Rather thanCCDs the FOC usedphoton-countingdigicons as its detector.^[1]

The camera was designed to operate at low, medium, or high resolution. The angular resolution and field of view at each resolution were as follows:^[3]

Wikimedia Commons has media related toFaint Object Camera.

• First FOC image
• Images of Nova Cygni 1992 With Hubble's Old and New OpticsArchived 2015-03-06 at theWayback Machine
• Pluto by FOC

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