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