Any DD will open fire on the periscope in calm seas. I've taken (extremely minor) damage from a DD some 1500m away that had spotted my scope while I was on approach for a convoy.
I've also had DD's shoot at my scope from some 500-800m in moderate seas. In heavy sewas I usually don't need to worry about keepign my scope down.
All this is while using a variation of the Trigger Maru sensors configs.
In stock game, I've had a DD head right for my scope - 1000-1500m away (outside his active sonar range) - while I was stopped at periscope depth, silent running on. His clumsy DCing led me to believe he wasn't really high up in the ranks (he totally missed me on 3 consecutive runs before I got below thermal).
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