The on {HEAD ~ axis} spacing between {TAIL ~ the first lens} and second lens is T12, the focal length of the imaging lens system is f, and they satisfy the relation: 0.5<×100<15 
spacing between
The on { HEAD ~ axis } spacing between { TAIL ~ the first lens } and second lens is T12 , the focal length of the imaging lens system is f , and they satisfy the relation : 0.5<×100<15
OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL 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