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。
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。
By combining DO lens elements with normal refraction elements, color aberration is corrected to levels even higher than is possible with fluorite elements.
DO镜片与普通的折射玻璃结合在一起，色散的校正水准甚至高于萤石镜片。
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