The sensor head 14 wherein {HEAD ~ said first reflecting means} is said afocal three mirror anastigmat, {TAIL ~ the mirrors} of said three mirror anastigmat being coupled with said optical housing and said switching assembly 
The sensor head 14 wherein { HEAD ~ said first reflecting means } is said afocal three mirror anastigmat , { TAIL ~ the mirrors } of said three mirror anastigmat being coupled with said optical housing and said switching assembly
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH