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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planetMitch

chief astronomer at planet5D LLC
Mitch "planetMitch" Aunger is the creator and mastermind behind planet5D.com — which covers every aspect of HDSLR cameras (and a whole lot of other cameras as well). A lover of photography since his early days, he graduated to selling stock photos to make a little bit of spare cash. It wasn’t much, but it allowed him to upgrade to better cameras as well as computers, and it wasn’t taking money away from feeding his family.
He loves the stories that the still image can tell. In the summer of 2008, he read a story written by Arnold Kim called “I Quit My Job” — Arn is the owner of macrumors.com. He started macrumors in 2000 as a hobby, and by 2008 he was making more money with the site than he was on his day job, so he quit. The surprise to the story is that he was a doctor making more than six figures! Right then and there, planetMitch dreamed about doing the same thing.
September 2008 rolled around, and Canon announced this new version of the incredible 5D — the Canon EOS 5D Mark II. It was the first Canon DSLR to shoot full HD video and the earth moved! (It really was a huge deal in the photography world.) planetMitch knew if there was ever a chance to ride a wave of something he was really passionate about, this was it — and the blog at planet5D.com was born. It is now one of the most popular HDSLR blogs on the planet, and he is making a full-time living from blogging. He couldn’t be happier!
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