The braking device is moved forward by {TAIL ~ a shutter opening member} near {HEAD ~ the end} of aperture opening by the shutter opening member, and is moved backward by the shutter closing member near the end of aperture closing 
The braking device is moved forward by { TAIL ~ a shutter opening member } near { HEAD ~ the end } of aperture opening by the shutter opening member , and is moved backward by the shutter closing member near the end of aperture closing
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH