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240fps slow motion video doesn't work right under florescent lights

J

JoeTomasone

macrumors 6502a
Original poster
Aug 8, 2014
516
81
Very pronounced flicker that doesn't show up at 120fps. Use 120fps if you are shooting under those lighting conditions.
 
Well, it does work "right" technically, because fluorescent lights pulse at fewer than 240 fps, it's just that you never saw it before. Good thing to be aware of though.
 
What he said. That's just the way the lights work. Too fast for our eyes to perceive.
 
Hahaha. It works perfectly, because fluorescent lights turn on and off at 120Hz usually - its actually recording the lights faster than your eyes can notice! :)
 
Thanks

Thanks guys for this. I was working in the office here on a Saturday (loser) and I went to slow mo and panicked. Called Apple and while I was on hold found this webpage.

Seems like the office lights are wrecking the slow mo effect lol. I'll check again when I'm home, but just wanted to say thanks :)
 
Mike85 said:
Thanks guys for this. I was working in the office here on a Saturday (loser) and I went to slow mo and panicked. Called Apple and while I was on hold found this webpage.

Seems like the office lights are wrecking the slow mo effect lol. I'll check again when I'm home, but just wanted to say thanks :)
Click to expand...

Mike,

I tried a 240fps outside and it works fine. Like the folks here said, it's due to the nature of the lights and our perception of them. I wanted to make people aware so that they didn't panic, and I'm glad that it worked in your case. :)
 
Here's my latest SLo-Mo with enough flicker to cause a SEIZURE.
I know it's from my LED lights over the terrarium. You can even see the flicker in the original video before I slow it down from 240fps to 24fps in Adobe Premiere.

https://www.youtube.com/watch?v=XwXN3uXovi4

Guess I'll be using different lights to record these Poison Dart Frogs.
Steve
 
Electric lights powered by AC will have a flicker at 60Hz. That's the cycle rate of the electricity.
 
Jman13 said:
Electric lights powered by AC will have a flicker at 60Hz. That's the cycle rate of the electricity.
Click to expand...

YES - BUT, look at my OTHER iPhone 6 plus Slo-Mo videos:

(More of my Poison Dart Frogs)
https://www.youtube.com/watch?v=kxUGUr2s3j4

https://www.youtube.com/watch?v=uH0-54gqxrs

Neither one was recorded under LED and neither have this kind of flicker. They where actually recorded under T-8 lighting. So since they are also "electric lights" why do they NOT record flicker?

Thank you!
 
Steverd99 said:
YES - BUT, look at my OTHER iPhone 6 plus Slo-Mo videos:

(More of my Poison Dart Frogs)
https://www.youtube.com/watch?v=kxUGUr2s3j4

https://www.youtube.com/watch?v=uH0-54gqxrs

Neither one was recorded under LED and neither have this kind of flicker. They where actually recorded under T-8 lighting. So since they are also "electric lights" why do they NOT record flicker?

Thank you!
Click to expand...

Because as mentioned earlier, these are probably incandescent lights, which work not by semiconductors emitting (and alternately not emitting) light using one phase of the alternating current (because semiconductors are typically DC-operated), but by a filament being superheated by the current, regardless of which direction it's flowing.
 
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