1) Depth of Field For bird watchers, the depth of field is a relatively contradi...
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Types of Binoculars (Porro Prism vs Roof Prism) Binoculars can be divided into t...
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The function of the eyepiece is to magnify the real image (intermediate image) m...
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How far a telescope can see is related to the size of the aperture, the larger t...
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A telescope is a visual optical instrument used to observe distant objects. It c...
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Binoculars (hereinafter referred to as "binoculars") have the advantages of clea...
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Whether it is used to monitor the enemy's situation or use ordinary terrain surv...
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If the telescope has an equatorial mount, the telescope's right ascension and de...
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