a changing step of changing {HEAD ~ the offset value} based on {TAIL ~ the image blur correction amount} and the shake level 
based on
a changing step of changing { HEAD ~ the offset value } based on { TAIL ~ the image blur correction amount } and the shake level
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH