FOCUS, aka E831, is a heavy-flavor photoproduction experiment located in the Wide Band Area of Fermilab. It is an upgraded version of its predecessor, E687. The experiment accumulated data during the 1996-1997 fixed target run and has fully reconstructed more than one million charm particles using the `golden mode' decays, D⁰→ K⁻ π⁺, D⁰→ K⁻ π⁺ π⁻ π⁺, and D⁺→ K⁻ π⁺ π⁺.

FOCUS is an international collaboration with institutions in:
Brazil	Italy	South Korea	Mexico	Puerto Rico	USA

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