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 truckload shipping different people's shipments on a trailer and since each shipment is technically “less than a truckload” they would consider that to be LTL. There are also freight companies who do not specialize in truck loads, but rather, consolidate larger volume shipments from about 2 to 12 pallets (or about 4000 to 24000 pounds) and consider themselves LTL Carriers. Finally, the most commonly referenced LTL is shipped via “common” carriers who handle freight above what would normally ship via FedEx Ground, or UPS or U.S. Mail parcel services (about 150 pounds) to just under what would usually be considered a Truck