35mm lens adapters have been popular for a while. They were the go-to thing until DSLRs started recording video, it seems.
Check out Letus35 and RedRock Micro. These work by using 35mm lenses to project the image onto a translucent surface that is the size of 35mm film. Your video then records that image. It’s like taking your camera into a movie theater and recording what’s on screen.
