I wish you gave us a bit more of the technical info so we could be of some help, I have recently been working on some night shots and they are not easy to get everything just right, I seem to get the best results with a shutter speed of 8 seconds to bring out the cripness in the lights. If you are shooting in the blue hour try 3.5, P.S. Dont forget a trypod, hope this is of some help, Best Regards, Sandra