an extreme wide angle lens which does not attempt to correct the distortion and produces an image like you would see in a convex mirror
An extremely wide-angle lens that enables views exceeding 100 degrees up to 180 degrees, but distorts the image.
This is an extremely wide-angle lens. A fish-eye lens magnifies the parts of the image near the center of the image and reduces the parts that are far away from the center.
An extremely wide-angle lens that can take in a huge panoramic view but distorts the edges of the image.