Top panel: transmission (solid) and reflection (dashed) of the red/vis (red) and vis/blue (green) dichroics, respectively, the QE of the EMCCD camera (solid black), and the QE of the focus camera (dot-dashed blue). Middle panel: instrument efficiency of the red (solid red line), visual (dashed green line), and focus channel (blue dot-dashed line). Bottom panel: normalised passbands of the Johnson-Cousins UBVRI photometric system (dashed lines) plotted along with the system sensitivity of the SDSS u′g′r′i′z′ camera (solid lines). The latter is based on a sensitivity determination made by Jim Gunn in June 2001, which is available as a FITS file at http://www.sdss3.org/instruments/camera.php.
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