Doing a smooth day to night (or the reverse) transition without flicker may look easy but it is not for a simple reason: changes in the exposure are done in fractions or 1/3 (or 1/2) of a stop. This means that from one frame to the next, the exposure will jump by a non trivial amount, resulting in a flicker in the end video.

Solution 1: post processing

A lot of people try to solve this issue by adjusting the exposure value of the images to smooth out the change. No need to say how much of a time sink this can be!

Solution 2: hardware help

The preferred solution of pro timelapsers is to use a little device called the Little Bramper. This device smooths out the exposure variations by controlling the exposure time in bulb mode, changing this value by a fraction of a second at the time instead of a fraction of a stop. This results in a much smoother change.

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 For complete timelapse training, buy this ebook for only $14.99 and get instant answers!

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For complete timelapse training, buy this ebook for only $14.99 and get instant answers!

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Solution 3: Magic Lantern

For those of you with Canon HDSLRs, you can look at Magic Lantern version 2.3 or better. It has a function in it for doing timelapses and ramping for sunsets and sunrise.

Here is an example:

Mindrelic – Manhattan in motion

(granted this is a complete timelapse, but they did use the Little Bramper

Here is a simple one shot example:
Little Bramper Swami Time Lapse

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