Field-glasses
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Field-glasses
Field-glasses, also known as binoculars, are optical instruments used to magnify distant objects. They consist of two identical telescopes, one for each eye, mounted side by side and aligned to point in the same direction. This design allows the viewer to see a magnified and stereoscopic image of the object being observed. Field-glasses are commonly used in a variety of applications, including birdwatching, hunting, military operations, and astronomy. The basic design of field-glasses has remained largely unchanged since their invention in the early 17th century. They typically consist of a pair of objective lenses at the front of each telescope, which gather and focus light from the object being observed. The light then passes through a series of prisms and lenses, which magnify and correct the image before it reaches the viewer's eyes. The magnification power of field-glasses is determined by the ratio of the focal lengths of the objective lenses and the eyepieces. Field-glasses are available in a wide range of sizes and magnification powers, from small pocket-sized models to large, heavy-duty instruments used by astronomers and military personnel. They are also available in a variety of optical designs, including porro prism, roof prism, and Galilean. Each design has its own advantages and disadvantages, depending on the intended use of the instrument. In conclusion, field-glasses are essential tools for anyone who needs to observe distant objects in detail. They are available in a wide range of sizes, magnification powers, and optical designs, making them suitable for a variety of applications. Whether you're a birdwatcher, hunter, astronomer, or military personnel, there is a pair of field-glasses that will meet your needs.
optical instruments, telescopes, magnification, prisms, porro prism, roof prism, Galilean
CITATION : "William Martin. 'Field-glasses.' Design+Encyclopedia. https://design-encyclopedia.com/define/field-glasses?E=341566 (Accessed on October 14, 2026)"
Field-glasses on Design+Encyclopedia
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