ISO is a rough measure of sensitivity to low light.

ISO大致是在暗光下对光的敏感程度。

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If star trails are desired, using a large aperture and higher sensitivity (ISO 200-400) can enhance the brightness of each streak.

如果需要星光轨迹，那么使用大光圈和较高感光度(ISO 200 - 400)就能提高每条轨迹的亮度。

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This is extremely important, because it determines how fast and at what light sensitivity (ISO) your camera can shoot in different lighting conditions.

光圈非常重要，因为它决定你的相机在不同照明条件下拍摄速度有多快，以及拍摄时的感光度(iso)为多少。

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To complement the speed of the f1.8 lens, the camera's low-light mode automatically adjusts the ISO sensitivity up to ISO 12, 800 to take sharp, full-resolution photos in dim conditions, and an easily accessible built-in pop-up flash and AF illuminator brightens low-lit subjects, reduces red-eye and fills in dark areas.

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With a top sensitivity of ISO 12800 and approximately 12.0 effective megapixels, it boasts remarkable high-sensitivity, low-noise capabilities and assures high-speed image data readout to deliver high-resolution images.

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That's essentially what you can do with the Canon 5D Mark III -- with a top sensitivity of ISO 102, 400, what was once unfathomable could soon become an acceptable standard.

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