An apparatus for positioning {HEAD ~ the eyepiece} comprises {TAIL ~ a photographic positioning cam sleeve} formed with a photographic positioning cam slot, and a dioptry adjusting cam sleeve formed with a dioptry adjusting cam slot 
An apparatus for positioning { HEAD ~ the eyepiece } comprises { TAIL ~ a photographic positioning cam sleeve } formed with a photographic positioning cam slot , and a dioptry adjusting cam sleeve formed with a dioptry adjusting cam slot
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL 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