Aspherical lenses, which have nonspherical curvature, are inserted between the usual spherical lenses so light is focused uniformly on all pixels, improving sharpness.

• 通常把镜片曲率不是球形的非球面镜片，置于球面镜片之间以调整光线，让焦点落在像素上，用来改善影像清晰度。