1. The Dutchman Hans Lippershey invented the telescope in 1608, but there are ru...
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Novice must read: the most important issues before buying binoculars I believe t...
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Maintenance of the telescope 1. Ensure that the telescope is stored in a ventila...
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1. The field of view of the tube night vision device is round, and the field of ...
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The function of the built-in compass of the telescope and how to use it How does...
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The principle and scope of application of thermal imaging night vision The therm...
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The telescope consists of an objective lens and an eyepiece. The convex or conca...
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The function of the eyepiece is to magnify the real image (intermediate image) e...
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