{HEAD ~ The sensor head} 14 wherein 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 
wherein
{ HEAD ~ The sensor head } 14 wherein 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
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH 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