The present invention provides {HEAD ~ a single telescope} with {TAIL ~ a pair} of three mirror anastigmats which may be moved with respect to one another to provide a multiple field of view optical system 
The present invention provides { HEAD ~ a single telescope } with { TAIL ~ a pair } of three mirror anastigmats which may be moved with respect to one another to provide a multiple field of view optical system
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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