Owning a high-performance telescope is the wish of every travel enthusiast. At p...
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Fixed astronomical telescopes are generally installed in astronomical domes or o...
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In fact, the reasonable multiple of the telescope is related to the aperture of ...
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Factors affecting the surface shape of optical lenses; 1. If the surface of the ...
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I remember when I was young, TVs and air conditioners were not as popular as the...
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With the development of the times and the development of science and technology,...
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①Aperture: The effective aperture of the objective lens determines the performan...
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When shopping, we are often attracted by a wide variety of items, considering co...
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