In real life the Op. Scope was known as the ''sky scope'' it was useful for, well as the name suggests, aeroplanes. It was bigger than the Attack scope, and captians didnt like using it as it left a bigger wake and was easier to spot during the day.
In game, I find it easier to scan the horizon because of the 1X magnifacation and has a higher max angle then the attack scope, also it useful for a back-up scope if your attack one is damaged.
As for the difference of the visibility of the two scopes to the enemy, I dont think it makes too much difference.....
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