改进了对焦准确时，用欧共体20个镜头。
Improved the focusing accuracy when using the EC-20 Teleconverter.
文章还进一步讨论了提高自动对焦准确度的措施。
The paper further discusses the measures for improving automatic focusing accuracy.
对焦准确性有所改善，但在近距离和F1.4时，尤其在低反差时，对焦就会稍有前移。
Focus accuracy was generally impressive, although with a certain tendency towards slight front-focus at close distances and F1.4, especially with low-contrast subjects.
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