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 New York than Algebra II in the 11th grade. In Math A, students learn to how write, solve, and graph equations and inequalities. They will also learn how to solve systems of equations, quadratics, as well as exponents, exponential functions, polynomials, radicals, and rational expressions. Other topics included are probability and statistics. Geometric concepts such as right triangles are also introduced. The course works in conjunction with New York State's Standards for Mathematics. One course lasted three semesters, after which students took the Regents Math A Examination. Math A/B took the place of the former "Course 2" curriculum, which focused almost solely