synonymBinoculars(Astronomical observation tool) generally refers to binoculars (astronomical telescope)
Binoculars, also known as“Binoculars”。By twoMonocular telescopeA telescope formed in parallel.twoeyepieceThe distance between them can be adjusted so that both eyes can observe at the same time, thus obtaining a three-dimensional sense.If you use twoGalileo telescope, then“Opera spectator”。Its lens tube is short, and its field of vision and magnification are small.If you use twoKepler telescope, the mirror is longer and inconvenient to carry;Therefore, a pair is often added between the objective lens and the eyepieceTotal reflection prism, makeIncident lightAfter many times in the mirror tubereflex, to reduce the length of the cylinder, and at the same timeobjective lenseAccomplishedInverted imageAnd turn it upside down to becomePositive image。This device is called“prismatic field glasses”Or "prism telescope" for short, which has a large field of view and is commonly used fornavigation, military snooping and field observation.[1]
also calledBinoculars。It is an observation instrument composed of two telescopes with the same performance, which meets the requirements of people's binocular observation.It is a military basic observation instrument, which is used to observe terrain, detect enemy situation, and roughly measure target distanceBearing angle, high and low angleImpact pointDeviation.Non military uses are also extensive.The two mirror barrels are generally connected by the hinge axis as the reference, and the mirror barrel rotates around the hinge axis to change the twoeyepieceThe distance between the eyes of the observer and the distance between the eyes of the observer can be adjusted.Eyepiece can be adjusted“luminosity(Visibility), equipped with filter accessories.[2]
structure performance
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The field binoculars and prismatic binoculars are small and can be used in the hand.They can magnify distant objects, so through them, distant scenery can be seen more clearly.Unlike monocular telescopes, binoculars can also give users a sense of depth, that is, perspective.The reason for this is that when people's eyes view the same image from slightly different angles, it will produce a three-dimensional effect.
Galileo field binoculars
For field binoculars or prismatic binoculars, an increase in magnification means a reduction in the field of vision.Therefore, it is difficult to determine the position of a target with a high power telescope.Most people can hold the prismatic binoculars with a magnification of 6 or 8 times steadily to see the distant scenery.If the magnification is more than 10 times, it is recommended to use onelampstand。A wide field of vision is required to watch fast-changing sports games on site, so it is best to use prismatic binoculars with magnification of 5 or 6 times.When tracking bird flight and observing panorama, it is better to use 7-fold or 8-fold prismatic binoculars.[3]
Prismatic binocular
working principle
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At alloptical instrumentMedium, exceptcameraIn addition, the most popular is binoculars.It enables people to watch sports games and concerts more carefully, which adds a lot of fun.In addition, the depth feeling provided by binoculars is also beyond the reach of monocular telescopes.The most popular binoculars useConvex lens。Since convex lens can reverse the image from top to bottom and from left to right, a set ofPrismcorrectionInverted image。lightThrough these prismsobjective lenseToeyepiece, including four timesreflex。In this way, light travels a long way in a short distance, so the binocular lens can be much shorter than the monocular lens.
effect
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The largest binoculars can magnify the scene 35 times.Compared with ordinary medium-sized binoculars, they have a magnification of 6-7 times, and the image is very clear. They are suitable for observing wild birds or other scenery.The 7 × 50 engraved on the cylinder represents that the magnification is 7 timesdiameterIt is 50 mm.[4]
Life use
Bird watchers often use binoculars to make distant objects (such as birds) look larger.Binocular telescope is actually just a pair of binoculars, each eye looking at one side.There are multiplePrism(triangular glass) zigzagReflected light, making binoculars much shorter than monocular telescopes;The prism also keeps the image upright.With binoculars, you can judge the distance with two eyes at the same time, but not with a monocular telescope.[5]
Military binocular
Military binocularsKeplerBased on the telescopic optical system, it is formed by adding an image conversion system (usually prism image conversion).The mirror tube can be equipped withInfrared sourceTargetedPhotosensitive element。Generally, the adjustment range of eye distance is 54mm - 74mm, the visual magnification of handheld is 6x - 15x, and that of rack mounted is 20x - 40x.The optical performance of binoculars is usually based on two sets of numbers
× D means.[2]
Scientific advice
The astronomical landscape Ares is near the moon, so binocular observation will be better.[6]
