The ACS solar blind channel (SBC) is a photon-counting MAMA detector capable of producing two-dimensional imaging in the UV at wavelengths 1150-1700 Ê, with a field of view (FOV) of 31" Ú 35". We will describe the on-orbit performance of the ACS/SBC from an analysis of data obtained from the service mission observatory verification (SMOV) programs. Our presentation will include assessment of: the point-source image quality and point spread function (PSF) over the SBC FOV, the dark current measurements, the stability and uniformity of the flat fields, the geometric distortion, and the UV sensitivity monitor to check for contamination. Where appropriate, a comparison with pre-launch calibration data will also be made.

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