Video Engineering

I'm recording some face-to-camera videos with a Google Pixel 6 through a cheap Ali Express teleprompter but I'm having a hard time getting good decent focus on my face.

I've tried using a printed focus target taped up at the same distance as my face but evidently the sweet spot of my focus is way narrower than that.

Any suggestions? Any Android apps that can automatically keep a face in focus perhaps?

Awesome innards of this reflective LCD system. Light from the main bulb comes in bottom, is diffused and split two ways by a double beam splitter, filtered, polarized, split again on left branch, producing 3 uniform channels of vivid red, green, and blue light. Each channel enters a prism, reflecting off an HD LCD element bonded to the back surface of each prism, after which each channel is directed by its respective prism towards another double beam splitter that combines all three channels into one image, and then sent to a short throw projection lens with a 90 turn. It was fun to tear down. The LCD prisms, beam combiner, and projection optics were mounted to a common cast metal chassis to keep alignment. Loads of special coatings on all the glass, and cool reflections. We played with the parts for hours last night.

Looks like he's figured out what needs to be done for iOS to properly intake USB video device class stuff.

https://www.febon.net/products/usb-uvc-webcam-to-lightning

There's a picture of the PCB he designed with some core components blurred out.