The display size is generally small, and the size of the lens [monocular] suitable for both eyes to watch at the same time is relatively large. Therefore, for the general knowledge, when these two lenses are assembled to the telescope, the display will inevitably correspond to the end with the smaller opening, and the eyepiece will inevitably correspond to the second end with the larger opening. Therefore, the observation chamber is a conical structure, which should be a learning technology<br>
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