鱼眼镜头的光路追迹

LIGHT PATH TRACING OF FISH EYE LENS

鱼眼镜头的视场角高达180或超过180°，运用通常的光路计算程序无法对鱼眼镜头进行光路追迹。本文介绍先借用尝试光线确定一个适当的起始点，然后用迭代法计算出主光线和边缘光线的位置，最后给出计算实例。

The field angle of fish eye lens can reached or exceed 180°, so the light path can of fish eye lens not be traced by an ordinary program. A proper starting point is dertermined at first by attempting ray, then position of principal ray and marginal ray is calculated with iteration method. Finally a examples is given.