一般情况下,旋转对称的成像系统,物面法线平行光轴。物点发出光线方向平行光轴,并具有一定孔径角(比如±10°)。但有时在非旋转对称的系统中,如果物点发出的光线(主要方向)与光轴有夹角,比如5°,此时应该怎样设置呢?此时,成像的光线孔径角不再关于光轴对称,比如(-5~15°)。此时,利用了更大孔径角的光线成像,像质可能会变差。
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