Gear:

• Canon EOS 200D
• Tokina AT-X Pro SD 11-16mm f/2.8 (IF) DX
• Tripod

Weather:

• Light cloud cover

Software

• Rawtherapee (RAW file importing, optical correction)
• GIMP

The Tokina lens suffers from quite bad chromatic aberration (red/blue/green ghost images) in long exposure night images as seen here:

Fortunately Rawtherapee takes care of all but the most severe defects when you import it.