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The Prime Focus Spectrograph (PFS) is a new optical/near-infrared multi-fiberspectrograph designed for the prime focus of the 8.2m Subaru telescope. PFSwill cover a 1.3 degree diameter field with 2394 fibers to complement theimaging capabilities of Hyper SuprimeCam. To retain high throughput, the finalpositioning accuracy between the fibers and observing targets of PFS isrequired to be less than 10um. The metrology camera system (MCS) serves as theoptical encoder of the fiber motors for the configuring of fibers. MCS providesthe fiber positions within a 5um error over the 45 cm focal plane. Theinformation from MCS will be fed into the fiber positioner control system forthe closed loop control. MCS will be located at the Cassegrain focus of Subarutelescope in order to to cover the whole focal plane with one 50M pixel CanonCMOS camera. It is a 380mm Schmidt type telescope which generates a uniformspot size with a 10 micron FWHM across the field for reasonable sampling ofPSF. Carbon fiber tubes are used to provide a stable structure over theoperating conditions without focus adjustments. The CMOS sensor can be read in0.8s to reduce the overhead for the fiber configuration. The positions of allfibers can be obtained within 0.5s after the readout of the frame. This enablesthe overall fiber configuration to be less than 2 minutes. MCS will beinstalled inside a standard Subaru Cassgrain Box. All components that generateheat are located inside a glycol cooled cabinet to reduce the possible imagemotion due to heat. The optics and camera for MCS have been delivered andtested. The mechanical parts and supporting structure are ready as of spring2016. The integration of MCS will start in the summer of 2016.

Metrology Camera System of Prime Focus Spectrograph for Subaru Telescope