I am always blown away by this stuff, but it still applies some distortion to the image in a way that feels slightly unnatural. It's similar to the effect that

I am always blown away by this stuff, but it still applies some distortion to the image in a way that feels slightly unnatural. It's similar to the effect that changing focal length on a camera has. eg. Wider angle lenses seem to squish far away objects and enlarge closer objects. However, this affects the entire image in a consistent way whereas changing focal length does not. I wonder if this could be used to simulate focal length changes?