Holy Grail Transition
A time-lapse that runs across a large change in light, such as day into night, requiring exposure to change during the sequence.
Measured in
stops
In depth
The difficulty is that fixed manual exposure fails as the light changes by ten stops or more, while automatic exposure flickers frame to frame. The solutions are bulb ramping, which alters exposure in tiny controlled increments, or shooting in aperture priority and deflickering in software afterwards.
Examples in practice
A sunset sequence ramps from 1/500 s to 20 seconds across two hours without any visible step.