This is a full-frame fisheye that distorts rather pleasantly rather than going over the top. Fisheye lenses are all about the distortion (getting close to a subject and watching the background wrap-around). It’s a fantastic way to exaggerate the cuteness of kids and animals or focus your composition on a single subject. A fisheye is pure fun and a very different way of seeing the world.
This lens uses the full-frame, so all of the camera’s pixels are usable in the final picture.