[kencaleno]

horizon is not level. Here's my take on nightshots:

At twilight, that is from about 30-45 minutes after sunset, is the ideal time to capture night landscapes, just before the sky turns black. Here is where you find the “Sweet-spot”-the balance of natural ambient light and artificial lighting in city scenes. Best to arrive at your chosen venue about 30 minutes before sunset, then you can capture your sunset images first, then wait for the right time for the twilight shots.

A tripod, of course, is mandatory as exposures will be quite long. So, if you are able to lock up the mirror on your camera, this will help with avoidance of shake. If you have a remote control, terrific!-use this, too. If you don’t have either of these functions, just set self-timer for 10 seconds.
Aperture priority; bracket exposures, (1 stop over; One stop under) using shutter speed as the variable unit. Chimp your screen after each shot, to check progress.
White balance, of necessity, will be tungsten, of course, to reinforce the blue sky, and to help de-saturate the yellow artificial light, which can be overpowering. Experiment and try using Fluorescent White balance for brilliant color in the sky. Lowest ISO as usual-at least, at first! Aperture depends-F8 to F11 is the sharpest range for your lens, but you may need to forsake the threat of diffraction, and go for F16 or 22, if you are getting lens flare.

Regards, Ken