一般低档镜片厚舒适性差，清晰度比中高档稍差些。

General low-end lenses of thick poor comfort, clarity than high-grade slightly worse.

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一般地说，区别较差相机与较好相机的一个性质指标时该相机能以多快的速度聚焦——在地反差的区域上能以多高的清晰度聚焦。

Generally, one quality that separates the better cameras from the lesser cameras is how quickly the camera can focus — and how well the camera can focus on areas of low contrast.

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