This photo was taken on 12 May 2012 early morning. Very fortunately, I witnessed the most spectacular sunrise in Blue Mountains.
This image was actually made by stitching and blending from 4 separate shots taken successively - two shots to capture the lower part mountains and two shots to capture the sky, because my 16-35mm f/2.8L II lens was not high and wide enough to include both sufficient mountains and the sky that I wanted to present in my photo.
Two GND filters were used: .6 Lee GND hard and .6 Lee GND soft. Aperture: f/16, Focal Length: 18mm, Shutter Speed: 8 seconds, ISO: 100.