Sample image if needed: http://fc07.deviantart.net/fs71/f/2010/032/f/e/City_Lights_by_jo_i.jpg http://fc07.deviantart.net/fs71/f/2010/032/f/e/City_Lights_b...

Sample image if needed: http://fc07.deviantart.net/fs71/f/2010/032/f/e/City_Lights_by_jo_i.jpg http://fc07.deviantart.net/fs71/f/2010/032/f/e/City_Lights_b... That was f/32. The rings around the street lamps are diffraction artifacts.