= Advanced Camera for Surveys
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= ACS
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The <Advanced Camera for Surveys> is an imaging instrument on the <Hubble Space Telescope>, designed with separate wide-field, high-resolution and ultraviolet channels. Filters select spectral bands; dispersing elements also provide low-resolution <spectroscopy>. The different channels have different detectors and optical paths, so the instrument name alone does not specify the relevant <wavelength> coverage.<ACS Instrument Handbook by Space Telescope Science Institute>[Chapter 1: independent channels, filters, grism and imaging capabilities]{ref}
For an <exoplanet transit>, a sequence of dispersed images can be divided into spectral channels, each yielding its own <light curve>. Comparing fitted <exoplanet transit depths> constructs an <exoplanet transmission spectrum>. Detector response and pointing variations must be calibrated along with the planetary signal. Historical observations should be interpreted using the channel and observing mode actually employed.
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