What's nice (and annoying at times too depending on if you hit them by accident) is you can do this from where-ever in your boat.
So I can be on the bridge and just before I give the order to dive hit the keys to raise the periscope and by the time we start our dive and I'm popped back into the control room I can click on the O-scope and it'll be fully up.
Same with putting it down again after an attack run and you prepare to go deep. Usually I pop back to the control room to start the dive and meanwhile hit that key combo quick to get the scope going down.
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