The photographer must know how to minimize the inherent opticaldistortion of a very wide Angle lens.
摄影师必须知道如何使很宽的广角镜头固有的光学畸变最小化。
2
Making such a small space look spacious without opticaldistortion requires the right equipment.
在没有光学畸变的情况下，要使如此小的空间显的宽敞需要合适的设备。
3
Such telescopes are called reflectors, and they offer major advantages over refractors, which use two lenses and suffer from opticaldistortion effects.