Blue Hour at Lake Louise

Making this long exposure (1.6 seconds) of Lake Louise in Alberta, Canada after sunset inspired me to read about the blue hour.

While the scene was quite dark to the naked eye, a long exposure made while the Sony camera rests motionless on a tripod allows the sensor to collect all the blue light present at dusk, or nautical twilight.

A scientist named Chappuis discovered that the ozone layer absorbs ultra violet light, and after sunset this Chappuis absorption has a significant effect on the color of the sky. I’m going to have to learn more about light wavelengths to understand this in depth.

As a photographer, I will remember the soft and soothing effect of this blue hour. Some artists enjoy photographing city scapes featuring yellow incandescent light during the blue hour. Have you tried it?