对于摄影两个都不是最佳选择，因JPG比无损耗png小得多，也只是最低程序损失一点画质。

Neither are optimal options for photography, as JPG is much smaller than lossless PNG with only minimal loss of quality.

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佳能给这支专业大光圈长变焦镜头的升级在外观上看没什么区别，但是内部的升级让它的画质基本上处于同类镜头中的最佳水平。

Canon's update to its professional fast telezoom may look much the same on the outside, but internally it's been updated to give image quality that's quite simply the best in its class.

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