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Shooting a jam session for a friend on short notice tonight, I've got Portra 400 loaded and I don't have time to blow through an entire roll just to get something faster for it. Conditions are indoors in a large basement, they've got colored LED show lights and other light sources for the "stage." Any advice on getting more speed without having to shoot at f/1.7 all night? If I metered my shots at 800 and developed at box, do you think it'd turn out well or will everything be too underexposed?