Zooms in and out on character portraits. I've tried to balance it so that 1.0 is zoomed in close to the character's face, and -1.0 is a full body shot, however, your results may vary depending on your subject and what checkpoint you're using. I've had generally good luck up to +/-1.25 and even more in some cases.
This works with both anime and photorealistic generations. It was trained with humans in mind, and has not been tested with animals or scenery, so YMMV.
