Since people's discovery and understanding of the properties of light is a proce...
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Which multiple is more suitable? Generally speaking, hand-held binoculars at 7-1...
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The world's largest single-aperture 500-meter spherical radio telescope (FAST) p...
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Due to variable factors, the term "field of view" usually has two meanings, and ...
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Some properties of eyepieces are very important to the function of optical produ...
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1. Fugen eyepieces: eyepieces can be divided into two types: positive eyepieces ...
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Also called an eyepiece, it is usually a lens group that can be connected to the...
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Kepler binoculars generally rely on a rotating prism to obtain a positive image,...
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