Anastigmatic lens: Photographic lens corrected for astigmatism as well as other distortions.
消除纵横像差和其他畸变的摄影用透镜。
英语百科
Camera lens
A camera lens (also known as photographic lens or photographic objective) is an optical lens or assembly of lenses used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media capable of storing an image chemically or electronically.