在中等停止，焦距范围是如此之大，整个场景可以重现大幅上升。
At a medium stop, the focal range is so great that entire scenes can be reproduced sharply.
比如，与焦距为1000mm的望远镜相比，2000mm焦距望远镜的放大率和视场范围分别是前者的2倍和1/2。
For example, a telescope with a focal length of 2000mm has twice the power and half the field of view of a 1000mm telescope.
广角镜头：覆盖范围广阔的镜头。它的焦距长度短于所用菲林格式的对角线长度。
Wide-Angle lens: lens with wide covering power. It has a focal length which is less than the diagonal of the film format with which it is being used.
范围内的焦距，不仅扩大了在比较与前任在新的产品，但也出现了在长期上！
The range of focal lengths not only was enlarged in comparison with the predecessor in the new product, but also appeared at long last!
范围内的焦距，不仅扩大了在比较与前任在新的产品，但也出现了在长期上！
The range of focal lengths not only was enlarged in comparison with the predecessor in the new product, but also appeared at long last!
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