I need some advice on taking a few portraits in front of a city at night (specifically Pittsburgh on Mt Washington in case you know the area). I am working with an off camera flash 430ex ii, either a 50mm f1.4 or 24-70 f4 and the flash can be in a softbox if needed. I want the subject to be properly exposed but also get some sparkling city lights in the background. Going out to play with this setup tonight so any advice you have on what camera or flash settings would be appropriate would be appreciated. First time using off camera flash at night thanks for the help!