The Advanced Camera for Surveys (ACS) is a third generation scienceinstrument scheduled for installation into the Hubble Space Telescope (HST)during the servicing mission 3B scheduled for June 2001. The instrument hasthree different cameras, each of which is optimized for a specific set ofscience goals. The first, the Wide Field Camera, will be a high throughput,wide field optical and I-band optimized camera that is half-criticallysampled at approximately 570 nm. The second, the High Resolution Channel(HRC) has a 26 inch by 29 inch field of view, it is optimized for the near-UV and is critically sampled at approximately 630 nm. The third camera, theSolar-Blind Camera is a far-UV, photon counting array that has a relativelyhigh throughput over a 26 inch by 29 inch field of view. Two of the threecameras employ CCD detectors: the WFC a mosaic of two SITe 2048 by 4096pixel CCDs and the HRC a 1024 by 1024 CCD based on the Space TelescopeImaging Spectrograph 21 micrometers pixel CCD. IN this paper we review theperformances of the devices baselined as flight candidates.
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