The Advanced Camera for Surveys (ACS), scheduled to be installed in the
Hubble Space Telescope in March 2002, will significantly extend HSTs imaging
capabilities. We will describe the on-orbit optical alignment procedures and
results, detailing the image quality performance achieved. Comparison will
be made with the instrument specifications, ground test results and
published performance expectations. The residual aberration content over the
field of each channel will be described and compared with the optical model,
and various other performance measures, including sharpness and encircled
energy will be treated. The effects of the telescope focus oscillations due
to thermal variations ("breathing") will also be discussed.
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