Vignetting and distortion are both corrected excellently for a lens of this speed.
渐晕和变形都纠正了这种速度镜头出色。
2
Conclusions Patients with ametropia, esp. high myopia or anisometropia, should be provided a corrected glasses or contact lens in time.
结论对于屈光不正，特别是高度近视或屈光参差者应及时配镜矫治，框镜矫正不足时应选择接触镜。
3
By combining DO lens elements with normal refraction elements, color aberration is corrected to levels even higher than is possible with fluorite elements.