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When an observer requests deployment in the focal plane of one of ACAM's slits, the slit is positioned on the optical axis of ACAM, but there are small slit-dependent differences in the exact position, reflected as shifts in y position on the CCD, and tabulated below:

Slit width (arcsec) 0.5 0.75 1.0 1.5 2.0
Shift (arcsec) 0.62 0.34 0.00 -0.17 -0.24

The measurements were made on images of the back of each slit taken through the Sloan g2 filter (#219), and the shifts are relative to the measured position on the CCD of the 1.0-arcsec slit.

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Contact:  (ACAM Deputy Instrument Specialist)
Last modified: 30 April 2012