1. Use the Aperture Priority mode to get those professional looking portrait shots with the out of focus background
Using the “A” or Aperture priority on your camera’s mode dial gives you control of depth of field. Aperture settings are measured in “F-stops.” One thing to note is the wider apertures actually have lower numbers, while the more narrow apertures have higher numbers. For example, a F2 has a wider aperture than an F22. A wider aperture decreases the depth of field in your shot making the background more blurred out, but keeping you subject in focus.
2. Mix artificial and natural light for ideal city night shots
Time the taking of your images so that the light levels from each source (artificial and natural) is the same, which will produce an evenly exposed shot. Take a spot meter reading from both the sky and an area of the shot that’s well artificially lit. When the sky is still slightly brighter, start shooting using the spot metered setting for the artificially lit part of the scene. Continue to take pictures using the exposures. You should have a few shots that are perfectly exposed during the ten minute window where the scene will be perfectly lit.