This week I finally started testing my recently acquired Promote Control. This is my first foray into day to night (and vice versa) transitions during time-lapse. I will be documenting all of my tests here for my own future reference and to hopefully help someone else out with getting into the "Holy Grail" of time-lapse.
The First Setup: at Herberger Theatre in Downtown Phoenix
Sunset: 7:41 pm
Civil Twilight: 8:09 pm
Nautical Twilight: 8:44 pm
Astronomical Twilight: 9:23 pm
f/5.6 | ISO 100
Start Exposure: 1/6 | Interval: 15 sec | End Exposure: 25 sec | Ramp Duration: 1 hr 41 min
I started the ramping right at sundown, with the intention of it ending right at astronomical twilight. About halfway through the sequence I realized that the ending exposure would be way too bright. I used the live modification feature on the promote to start reducing the final exposure but it was too late to get the effect I really wanted. This is a bit of tough spot for exposure because there is no direct lighting on the side of the sculptures that are facing the camera and the fancy streetlights are very bright.
What I Would Do Next Time:
Next time at this location I will set the ending exposure to be 5 seconds. I will also have the ramping end approximately 20 - 25 minutes after civil twilight begins because the ambient light was so bright here that past that point you couldn't see much of the sky anyway.