cfccd_f1	- Cassegrain focus CCD direct subset=filter1
cfccd_f2	- Cassegrain focus CCD direct subset=filter2
cfccd_both	- Cassegrain focus CCD direct subset=filters
csccd		- Cassegrain focus spectroscopy
echccd		- Echelle spectroscopy
nfccd		- Newtonian focus CCD direct (Schmidt)
pfccd_f1	- Prime focus CCD direct subset=filter1
pfccd_f2	- Prime focus CCD direct subset=filter2
pfccd_both	- Prime focus CCD direct subset=filters