Nevermind Obs versus Att scope question :
Wiki:
"The observation scope, used to scan the sea surface and sky, typically had a wide field of view and no magnification or low-power magnification. The targeting or "attack" periscope, by comparison, had a narrower field of view and higher magnification."
So diff is magnification and field of view (guess in SH5 magnification of the two is equal though).
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