I was wondering what type of shutter speeds I should be using for night time city pics (skyline type stuff). The P setting on my Olympus E510 sets the aperture wide (like F4) and shutter relativity short 4-5 sec. Is it better to have longer shutter speeds (like around 30 sec) with the Aperture smaller (~F20) or a larger aperture with faster shutters? Which will provide sharper images? Here is an example of what I've been shooting.