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。
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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