6:30am :
the sky will start to have some deep blue color, at this point , the sky is starting to get little bit bright... color temperature is very cold
6:45am :
best time to shoot. color is still cold, good contrast and color tone should be present in the sky. Sometime, stars can still be seen at this instance. Shutter speed is about 1 min, good to catch some moving clouds.
7:00 am :
everything is bright liao. but the sun is not above the horizon yet. Not too good a time to shoot.
7:10am :
Sun just rise above the horizon. Contrast is high. light is very directional, shadows are long and color temperature starts to turn warm.
7:20am :
still can shoot. But need to use GND filter. The clouds formation will be clearly showing, white, gray, blue, orange. Watch out for high contrast between sky and foliage. The light intensity can be as high as 6 stops difference. Must use GND filters...
7:30am :
can start to pack up shop... and eat breakfast.