That term means nothing by itself, but since the earliest parallax adjusting scopes put the adjustment feature into the rotating objective bell of the scope, the term AO caught on. Look at the BSA AR 3-13x50mm scope and you will see the range numbers (in yards) engraved on the objective bell.
The Epson Photo Academy, operated by PG Consulting, is a specialised training platform offering world-class photography training across the broad spectrum of photography skills. Training programmes are available within the Academy for Amateur photographers and Photo Enthusiasts... [Read More...]
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