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Time Lapse Illuminance Variability
Feb 23, 2020 18:54:11   #
Mongo Loc: Western New York
 
The time lapse referenced below is the second time lapse I attempted with one of my D7200s. It was taken with the lens set to 18mm, a frame every 3 sec, 1/320 sec, f 5.6, and ISO 100. This one was done in video mode.

A previous one was done with successive stills, full resolution, then converted to jpeg. To get a movie out of it, I used ffmpeg on a Linux platform.

Both show variability in apparent illuminance of frames.

I was surprised that I observed that variance in this shoot, which was done in movie mode. I would like to get the mechanics down before I run off to specific locations to recreate the sunrise with more interesting subjects.

Any ideas why the variability in apparent illuminance in some frames?

https://youtu.be/ewVHqi0_NGY

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Feb 24, 2020 07:56:50   #
SonyBug
 
Set the ISO to a fixed value.

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Feb 24, 2020 08:51:15   #
controversy Loc: Wuhan, China
 
Mongo wrote:
The time lapse referenced below is the second time lapse I attempted with one of my D7200s. It was taken with the lens set to 18mm, a frame every 3 sec, 1/320 sec, f 5.6, and ISO 100. This one was done in video mode.

A previous one was done with successive stills, full resolution, then converted to jpeg. To get a movie out of it, I used ffmpeg on a Linux platform.

Both show variability in apparent illuminance of frames.

I was surprised that I observed that variance in this shoot, which was done in movie mode. I would like to get the mechanics down before I run off to specific locations to recreate the sunrise with more interesting subjects.

Any ideas why the variability in apparent illuminance in some frames?

https://youtu.be/ewVHqi0_NGY
The time lapse referenced below is the second time... (show quote)


You may want to check out LRTimelapse (http://lrtimelapse.com/) --- it's the be-all, do-all, end-all solution to creating timelapse videos with varying lighting transitions - including the night-to-day / day-to-night "holy grail" timelapses.

Here's a link to an example and tutorial video about creating one: http://lrtimelapse.com/

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Feb 24, 2020 10:47:48   #
Mongo Loc: Western New York
 
SonyBug wrote:
Set the ISO to a fixed value.


It was fixed.

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Feb 24, 2020 10:48:29   #
Mongo Loc: Western New York
 
controversy wrote:
You may want to check out LRTimelapse (http://lrtimelapse.com/) --- it's the be-all, do-all, end-all solution to creating timelapse videos with varying lighting transitions - including the night-to-day / day-to-night "holy grail" timelapses.

Here's a link to an example and tutorial video about creating one: http://lrtimelapse.com/


I will check that out. Thanks.

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Feb 24, 2020 22:36:34   #
Flyerace Loc: Mt Pleasant, WI
 
It looked to me that the sun reflected off, or shown through the clouds at a variable rate. I wasn't there, but that is what it looked like to me. Very nice product.

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