Are there any 180 degree (or more) circular fisheye lenses (cheap Chinese C-mount, perhaps?) without hood petals, with an image circle less than 24mm that would vignette completely on an A7? You could set her on her LCD screen on the ground, set the timer, hop out of the way, and have a panorama in one shot. Lenses like this used to exist for film so I wouldn't think what I'm looking for would be too hard to do. Thanks!