I took a 40-minute motion hyperlapse of a sunset, one frame every 3 seconds, and I noticed that the exposure wasn't especially even. If you watch this 6-second clip (sped up 2x in post), you'll notice the sun vibrating in size, and the exposure level vibrating in synchronicity with the sun. Can I prevent that from happening? Or is there a way to fix this in post?
My mobile device is a Samsung Note 20 Ultra.


The 6-second clip:

Can't watch the video!

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Montfrooij Posted at 11-29 04:01
Can't watch the video!

Sorry about that, I fixed that.

DAFlys Posted at 11-29 08:44
You need to adjust the YouTube permissions on your video so we can see it.

Sorry about that, I fixed that.

Did you fix the exposure in the app?
Long time ago since I used osmo mobile.

Dangerly Posted at 11-29 14:19
Sorry about that, I fixed that. https://youtu.be/uXbBahEuzp0

Ahh, thats working now for me.

Dangerly Posted at 11-29 14:19
Sorry about that, I fixed that. https://youtu.be/uXbBahEuzp0

Lovely sun,  shame someone walked into frame during it.

Excellent footage

Did you use auto exposure or manual exposure?  I'd be interested to know if/how you were able to overcome the pulsing. Thank you.

tomlesser Posted at 4-5 06:28
Did you use auto exposure or manual exposure?  I'd be interested to know if/how you were able to overcome the pulsing. Thank you.

Hi, auto exposure. I posted this a few years ago. In the meantime, what I learned is that this is due to the way the camera quantizes shutter speed, since the aperture is fixed. That is, the shutter speed stays the same until it passes a certain point of being more dark as the sun sets, and then the shutter speed jumps to the next slowest setting. It's this jump that causes the pulsing / flashing. It's an artifact with most cameras doing time lapses of sunsets or similar.

There may be a fix but I haven't found one.

Dangerly Posted at 4-5 08:13
Hi, auto exposure. I posted this a few years ago. In the meantime, what I learned is that this is due to the way the camera quantizes shutter speed, since the aperture is fixed. That is, the shutter speed stays the same until it passes a certain point of being more dark as the sun sets, and then the shutter speed jumps to the next slowest setting. It's this jump that causes the pulsing / flashing. It's an artifact with most cameras doing time lapses of sunsets or similar.

There may be a fix but I haven't found one.

One simple fix is to use ND filter 8x or more to elongate the exposure time & then use 3 second interval that will reduce the exposure difference between shots & make it a smooth exposure ramping.

Another solution if you dont have ND filters is to use 1 sec time interval instead of 3 sec.

Hope this helps.