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