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
Mathematics education in Australia degrees. The course is divided into four (4) semesters. The areas learned are in the following: Semester 1 (Year 11/Form 5): Semester 2 (Year 11/Form 5): Semester 3 (Year 12/Form 6): Semester 4 (Year 12/Form 6): Since 2010, the Year 11 and 12 mathematics courses of study were: Mathematics courses 1A/1B and 1C/1D are non-ATAR subjects. However, new WACE mathematics courses are to be introduced for Year 11 students in 2015 and Year 12 students in 2016 in order to align with the Australian curriculum in Western Australia. The new WACE mathematics courses consist of four units. Each unit is