where, in said scanning lens system, {HEAD ~ focal distance} in said scan direction of said first scanning lens is designated by f1 and in said {TAIL ~ sub scan direction} is designated by f1 
in
where , in said scanning lens system , { HEAD ~ focal distance } in said scan direction of said first scanning lens is designated by f1 and in said { TAIL ~ sub scan direction } is designated by f1
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH