[bufferoverflow]

You can turn a Canon/Nikon DSLR into a webcam. Using SparkoCam.

So theoretically you can get a cheap old T3i + 50mm/1.8 and have a crazy good webcam with near-cinematic quality.

[spac]

I was very excited by the idea. Ironically, it's only available on Windows.

[ants_a]

You can do that on Linux too:

    modprobe v4l2loopback
    gphoto2 --stdout --capture-movie | ffmpeg -i - -vcodec rawvideo -pix_fmt yuv420p -threads 0 -f v4l2 /dev/video0