变焦比（Zoom ration）是指变焦镜头的最短焦点和最长焦点之比。
全球变焦比率(百分比)和字体大小缩放范围的申请。
Global zoom ratio (by percentage) and range of font size to apply zooming to.
佳能照相机拍出来的照片色彩比松下的要亮一点，但松下的16倍变焦比佳能的14倍变焦让我能定焦更远。
Color captured in images using the Canon looked a little brighter than those captured with the Panasonic, but the Panasonic's 16x zoom offered further reach than its rival's 14x lens.
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