In order to attain the highest quality images, the APO lens has been made using special low-dispersion (SLD) glass and is designed to minimize color aberration.

• 适马APO镜头，色散现象，有效减至最轻微。不同波长的光线，在折射后会形成不同的出射角，令不同颜色的影像出现些微分差，不能在一个平面上聚焦。