catalejo

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Catalejo refers to a handheld, optical instrument used primarily by military forces and astronomers alike for observing distant objects on land or at sea without being detected themselves. The term 'spyglass' is another name commonly used in the United Kingdom and other English-speaking countries to refer to this device. A telescope, on the other hand, is generally any type of optical instrument designed to gather light from a distant object and magnify it for closer inspection.