In yet another aspect, {HEAD ~ an image sensor} is moved in conjunction with one of the lens groups relative to {TAIL ~ a second} of the lens groups 
In yet another aspect , { HEAD ~ an image sensor } is moved in conjunction with one of the lens groups relative to { TAIL ~ a second } of the lens groups
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH