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ProEM is a 1024x1024 frame transfer camera with 13 micron pixels and optional electron multiplication readout, although we have never used that feature except on the commissioning run to observe the Crab pulsar. The camera is triggered by a GPS-disciplined double-quartz oven clock. The setup used most often is 4x4 binning for an effective pixel size of about 1/3 arcsecond. At the Cassegrain focus - currently the only available configuration - the plate scale of 7.3 2 arcsec/pixel mm yields an image about 1.5 arcminutes on a side.
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