2dF

2dF is a robotic fiber positioner on the 3.9-m Anglo-Australian Telescope (AAT) that positions 392 fibers so as to simultaneously capture spectra of that many astronomical objects that are spread over the a 2°-diameter circular region of the celestial sphere. It was actually commissioned as a multi-object spectrograph in the 1990s, at the time, incorporating a pair of spectrographs. After those two spectrographs were retired, the positioner has been used with newer AAT spectrographs, HERMES and AAOmega. The positioner places one end of the fiber on the necessary position on the telescope's focal plane, with the other end of the fiber located at a spectrograph's slit.