At full aperture, the depth of field (DOF) is extremely shallow.

在全光圈，景深(自由度)是非常肤浅的。

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This is most important on dark days or when a large DOF ( depth of field) is desired.

这在天色较暗或者需要大景深时尤其成问题。

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This is most important on dark days or when a large DOF ( depth of field) is desired.

这在天色较暗或者需要大景深时尤其成问题。

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