Space Telescope Science Institute   5.2 Important Considerations for ACS Imaging  5.2.2 Throughputs and Limiting Magnitudes

5.2.1 Optical Performance


Testing of the WFC and HRC cameras, following fine alignment activities on-orbit, has shown that the optical quality objectives of the cameras are met. The encircled energy values obtained from observations made in SMOV are given in Table 5.4.


Table 5.4: Encircled energy measurements for the ACS channels.
Channel
Encircled energy
Center of field
Edge of field
WFC at 632.8 nm in 0.25 arcseconds diameter
80.0%
79.4%
HRC at 632.8 nm in 0.25 arcseconds diameter
81.8%
81.6%
SBC at 121.6 nm in 0.10 arcseconds diameter
28%
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 5.2 Important Considerations for ACS Imaging  5.2.2 Throughputs and Limiting Magnitudes
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