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