Ultra wide angle lens the difference is only whether distortion is present or not. However, the shorter the focal length, the more difficult it is to implement rectilinear correction. In fisheye lenses, the visual angle is close to or more than 180 degrees in at least one direction. For example, a "diagonal fish eye" would have a viewing angle of at least 180 degrees within the diagonals of the frame. A "circular fisheye" would represent the image in the form of a circle. Rectilinear ultra-wide angle lenses are used in photography and cinematography sometimes to achieve three-dimensional perspective distortion instead of simply two-dimensional barrel
Less Than Hero episode received a Nielsen rating of 5.0/9. Zack Handlen of "The A.V. Club" gave the episode an A, saying: "Seeing Leela, Fry, and Bender work together as a team nearly always makes for something grand, and on the whole, “Less Than Hero” doesn’t disappoint. Its ambitions are modest, and it makes the most of them. Plus, it offers the rare chance to see super-heroes being ridiculous for no other reason than they want to. We could use more of that, really." Less Than Hero "Less Than Hero" is the fourth episode in the fourth season of the American animated television