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SCUBA-2 is the largest submillimetre wide-field bolometric camera ever built.This 43 square arc-minute field-of-view instrument operates at two wavelengths(850 and 450 microns) and has been installed on the James Clerk MaxwellTelescope on Mauna Kea, Hawaii. SCUBA-2 has been successfully commissioned andoperational for general science since October 2011. This paper presents anoverview of the on-sky performance of the instrument during and sincecommissioning in mid-2011. The on-sky noise characteristics and NEPs of the 450and 850 micron arrays, with average yields of approximately 3400 bolometers ateach wavelength, will be shown. The observing modes of the instrument and theon-sky calibration techniques are described. The culmination of these effortshas resulted in a scientifically powerful mapping camera with sensitivitiesthat allow a square degree of sky to be mapped to 10 mJy/beam rms at 850 micronin 2 hours and 60 mJy/beam rms at 450 micron in 5 hours in the best weather.

A new era of wide-field submillimetre imaging: on-sky performance of SCUBA-2