The blue hour comes from the French expression l’heure bleue, which refers to the period of twilight each morning and evening where there is neither full daylight nor complete darkness. The time is considered special because of the quality of the light at this time of day.San Carlos Bay on Sanibel Island causeway, Florida .
canon 5D mk2
canon 17-40mm focal 24mm
0.6 ND filter & Lee Pop Blue Hard Graduated Filter
30 second exposure