HDS efficiency

The following plot presents the total efficiency of HDS, including the atmosphere and telescope. This plot is also available in postscript format.

This plot presents the efficiencies of the image rotators and atmospheric dispersion corrector (ADC). It too is available in postscript format.

The degradation of NsOpt image rotators (both red & blue) was found in September 2013 (by the efficiency measurement after the primary mirror re-coating). Please be careful to employ image rotators in your program. Now (1/28/2014), HDS-ETC is including this effect of degradation.
There are no apparent changes in efficiency of HDS itself and NsOpt ADC.