2 A B C D E F G H I K L M N O P R S T U V W


stereographic lenses are a class of fisheye lenses

sterographic lenses are also called “ conform“or “ winkeltreu
stereographic lenses use image mapping functions of type
r = 2 f tan \frac{\theta}{2}

maintains angles

stereographic angles
weak medium strong max
94 131 180 <360

Example of a Stereographic image :

see Fisheye Types