哈勃望远镜切换其常规观测，在1月29日拍到一幅特写镜头，这极为罕见。
It was so rare that Hubble was switched from its observing routine to get a close-up of it on January 29.
他能装上镜头，如果不能在常规对焦区间的最近端对焦，那么近距对焦就不能工作，原因是机身内部的某种限制。
While he could mount the lens, if it was not focused at it's closest regular focusing distance, the close up range was inoperative due to some sort of internal body restrictions.
该设计可以满足投影鱼眼镜头的常规投影及通用性要求，结构简单，工艺性强。
The design can fulfill the requirements of common and general projections with its simpler structure and good technology.
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