Using periscope in rough seas

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I have noticed that while using the periscope in rough seas, the scope image doesnt roll in accordance with the boat. Try and you'll see. You have to pan down to see the bow or stern, though.
This is no biggie, but for a purist, I imagine it would be kinda unrealistic.
but for me, aint no thing but a chicken wing.

edit: whups, I should say that you have to be surfaced.