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