iPhone 13 Slo-Mo camera flicking

If you are filming indoors with LED bulbs and even incandescent bulbs, you will get flicker. Depending on where you live in the world, AC current is either 50 or 60 hertz and you are slowing that frequency way down to a visible flicker when using slow motion.

Greetings, Aalwin_iPhone13.

Welcome to the Apple Support Communities. We can understand why you’d want to resolve the issue with your camera. 

Start by working through these steps: If the camera or flash on your iPhone, iPad, or iPod touch isn't working 

We hope this helps! Thanks for being a part of the community.

Sincerely.

You're welcome.