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We have developed a wide-field mosaic CCD camera, MOA-cam3, mounted at theprime focus of the Microlensing Observations in Astrophysics (MOA) 1.8-mtelescope. The camera consists of ten E2V CCD4482 chips, each having 2kx4kpixels, and covers a 2.2 deg^2 field of view with a single exposure. Theoptical system is well optimized to realize uniform image quality over thiswide field. The chips are constantly cooled by a cryocooler at -80C, at whichtemperature dark current noise is negligible for a typical 1-3 minute exposure.The CCD output charge is converted to a 16-bit digital signal by the GenIIIsystem (Astronomical Research Cameras Inc.) and readout is within 25 seconds.Readout noise of 2--3 ADU (rms) is also negligible. We prepared a wide-band redfilter for an effective microlensing survey and also Bessell V, I filters forstandard astronomical studies. Microlensing studies have entered into a newera, which requires more statistics, and more rapid alerts to catch exoticlight curves. Our new system is a powerful tool to realize both theserequirements.

MOA-cam3: a wide-field mosaic CCD camera for a gravitational microlensing survey in New Zealand