Not everyone will like this photograph, because you have to really look at it to see what it offers. There are no special filters. This is simply a long exposure just before dawn that captures the emergence of blue on the visible light spectrum. Physiologists say that it has to do with the rods in our eyes, but here it appears on the camera's sensor. The shorter wavelengths of the blue light (which also have more energy by the way) are usually first to appear just before the sun comes over the horizon.

My title is taken from a wonderful Jazz album by Cassandra Wilson, "Blue Light 'Til Dawn".
www.youtube.com/watch?v=pcICh4cC3CE

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Make:	NIKON CORPORATION
Model:	NIKON D850
Exposure:	15
Aperture:	f/8.0
ISO Speed:	400
Focal Length:	120 mm
Lens:	Nikon AF-S NIKKOR 24-120mm f/4G ED VR