红外图像具有高背景，低反差，低信噪比等特点。

Infrared image has the features of high background, low contrast and low SNR.

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它同时具有高分辨率、低反差和优美的焦外成像。

It has a combination of higher resolution and lower contrast and superb out of focus images.

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对焦准确性有所改善，但在近距离和F1.4时，尤其在低反差时，对焦就会稍有前移。

Focus accuracy was generally impressive, although with a certain tendency towards slight front-focus at close distances and F1.4, especially with low-contrast subjects.

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