所谓曝光组合，简单的说就是指拍摄影像时光圈和快门速度设定值的组合。曝光组合的正确或者说适当与否，也同样会影响影像的清晰度。
一旦你找到了最佳曝光组合，你就可以通过调整来得到最佳的景深以及影像固化。
Once you find the right exposure, you can adjust the Settings to get the right amount of depth of field and motion in the image.
图片越多，组合就更花时间，而且更加复杂，所以合理地选择你的曝光数量。
The more you have, the longer it will take to combine and the more complicated it will become, so choose your number of exposures wisely.
但对许多短曝光的数字处理可以把彗星和恒星分开记录，并重新组合成最终的图像。
But a digital processing of many short exposures allowed frames of comet and stars to be separated, registered, and recombined in the final image.
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