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Advanced “Light Flicker in Video” Education

Photo Moment - April 05, 2019

Avoiding flicker while shooting high speed (slow motion) video under artificial lighting, or shooting in a foreign country can be a challenge. I knew HOW, but not WHY. Now I know why, and I want to share with you.

This video was shot on the LUMIX S1 with the 50mm f/1.4 lens wide open. Because I know someone will ask ;-)

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This show was fully scripted and read off a teleprompter, so this script is pretty darn accurate!

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Comments from YouTube

Great.. ! What am I. A mathematics Proffessor ? Come on..Dude (In the next Video we get what ??.., how to dismantle a nuke?)
It's a technical video… made it as simple as I could, for those who want to know WHY things work they way they do.
@PhotoJoseph Hey.. No worries. It was meant to be a sarcastic joke.. You can, t help me! being bad in school back than. You did your best. Thanx.
Haha thanks. Appreciate it… most of my videos aren’t that technical, if that helps ;-)
Nice video! I own a Panasonic s1. Do you know if synchro scan is supported? Is shutter angle available in this camera?
@PhotoJoseph thanks for the fast answer. I hope they include it in a future update.
Holy Slivovitz
PhotoJoseph you’re getting a headache either way
Good to know. Thanks!
Awesome Video! Production was spot on!
Very good information... You broke it down very well...
Fantastic channel! This is such good and detailed information! Really helpful - thank you so much!!
Thanks for the explanation! And indeed this is great to use, it has saved me a couple of times:
FLICKER - choose your font carefully when using this word, I remember a children's comic which gave away some FLICK cards as a cover mounted gift, the ink from the L bled into the I making a U. Just seeing your YouTube poster image reminded me of this story.
You should explain also why you can't use the G9 in LED lights too! It's would be great to know this before photographer buy this equipment (you inserted the link to the G9 in the description).
@PhotoJoseph OK I See...was my fault to buy a G9 and I will inform the hole world to use only flicker free Lights 🤣
@PhotoJoseph I try to explain that you have not always a choice when you are outside and can't change the lightning conditions and I explained the problem first sarcasm free. G9 has no possibility to change anything in 180fps or 150fps mode. Evtl. it is a NTSC Model and here is PAL (50Hz) but I am not sure and can't change it. At the end I avoid to film higher frame rates under lightning conditions because I had film some slomotions and can't use it. Thx for responses...
@PhotoJoseph thx for Sharing your deep know how. Helps a lot.
Good explanation but the the Panasonic G9 high speed video is worthless by LED lightning, because you can't chane SS or angle. We have 50Hz power, so the light will pulse with 100Hz and no frame rate will fit. I test it.
Thank you Panasonic again for this miss conception! 😠
This video is about understanding why flicker happens and the science behind avoiding it, not about specific camera models.
I was curious what camera and lens you shot this with. Thanks for putting it in the description. Looks great and super informative and clearly explained content as well
🤯 brain exploded
Great explanation. I really like the graphics very educational. Keep up the good work!
Great video on he math of lights and video. Another great subject would be to talk about fluorescent tube style bulb lights like in an office environment. Some older style fluorescent bulbs shift color temperature so while you're shooting in that environment, your video's color balance is shifting from green to blue and back to green. Newer bulbs don't do this but take it from experience, the older bulbs are still out there and will make you pull your hair out.
So how do you deal with the older bulbs? Color correct frame by frame?
@PhotoJoseph Thanks
@PhotoJoseph is absolutely correct but this happened to me in 2005 with a Canon XL1 camera. This went totally against everything we were taught in tv video production. You were to white balance the camera using a white card and you went with that as your white balance. Most tv cameras then didn’t have auto white balance so you got screwed when this happened. At that point, you’d color correct your video and dissolve between them to achieve a close to correct white balance.
Exactly! It’s called a learning experience. Luckily, I do have a background in tv production engineering. Sadly, at that time, the XL1 had a viewfinder that was b&w and we had no idea until we started edited the footage. Thank God for positive changes in technology like a better, more controlled white balance and better fluorescent bulbs. This is why I enjoy your videos, @PhotoJoseph. They remind me of my tv production days that I sorely miss.
I really like the shutter angle option on the GH5s. I have Phillips Hue bulbs and everything below 100% produces flicker for me. Even 95% brightness. I'll often have to change the shutter angle to 173 degrees in order to completely remove flicker, and even then I still notice it a bit in post. Luckily DaVinci Resolve has a built-in de-flicker tool that does a great job, especially when there is just minimal flicker. I've heard of people having issues with the Godox SL60W light, but I haven't noticed anything in my testing. This helps though! I haven't tested anything high speed yet, hoping I can get something working at 120fps.
Outstanding editing...
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