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Old hands with the Mosaic II camera are suspicious of the ADC, especially since it was damaged in the late 90's. It is believed that PSF's are better behaved if the ADC is not used at all (i.e. placed in its "nominal" position and left there) or set to the appropriate position at the beginning of an exposure then turned off. At high airmass and with broadband filters, the ADC makes a clear improvement over either of the above. Unfortunately, we do not have hard data to support these suspicions, but it is true that the ADC has suffered some significant damage that has not yet been fully resolved. We therefore make no specific recommendation at this time. Page created: 23 March 2004 by Tim Abbott
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