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