Deep Space 深空照片

Unlike portrait and landscape photography, deep space astrophotography requires much longer exposure time, i.e., from tens of minutes to several hours. Due to the spin of the Earth, tracking and guiding is a must during the exposure. It is also necessary to cool down the camera to avoid heat and noise of CCD.

跟普通人像和风景摄影不一样，深空摄影需要比较长的曝光时间，从几十分钟到几小时。由于地球的自转，所以在长时间曝光过程中需要对目标天体进行跟踪。另外，由于长时间曝光会使相机过热，因此对相机CCD的冷却也是必须的。