{"id":1148,"date":"2014-12-10T17:21:51","date_gmt":"2014-12-10T17:21:51","guid":{"rendered":"http:\/\/dev.austrinus.com\/?p=1148"},"modified":"2022-11-23T23:42:33","modified_gmt":"2022-11-24T02:42:33","slug":"binoculares","status":"publish","type":"post","link":"https:\/\/austrinus.com\/en\/binoculares\/","title":{"rendered":"Binoculars"},"content":{"rendered":"

\"binoculares-icon\"Binoculars are small refracting telescopes, which have a built-in prism system to shorten the support tube and avoid inverted vision. They have less magnification capacity than a telescope, but they have a greater field of view. To prevent vibrations, it is advisable to fix them to a photographic tripod. They are classified by the degree of magnification and the aperture diameter, in millimeters, of the front lens. a binocular\u00a07\u00d750<\/strong>, For example,\u00a0increases 7 times<\/em>\u00a0the image and has\u00a050 millimeters opening<\/em>. For the beginning fan, they are a very important piece of their team.<\/p>\n

This instrument is characterized by its ease of viewing objects, its wide field of vision and the sensation of depth, when using both eyes. It is the ideal method to learn about the characteristic objects of each constellation, to learn about and recognize the night sky. Its price is much lower than a telescope and it takes less paperwork to start using it. You can lie down on the ground and start to "scan" the sky systematically, or, if you have been using it for a while and plan to do more complex things, observing variable stars and searching for comets are two good objectives.<\/p>\n

Increases and openings<\/strong><\/p>\n

\"Aumentos<\/strong><\/p>\n

The binoculars have numbers engraved on them similar to \u201c7 x 35\u201d, \u201c10 x 50\u201d, \u201c7 x 50\u201d, etc. The first number (7, 10) refers to the\u00a0increase<\/strong>\u00a0that binoculars provide, the second is the\u00a0opening<\/strong>\u00a0expressed in millimeters. A \u201c7x50\u201d binocular will have 7x magnification and a 50mm objective; 7x is probably the most common magnification, but it is possible to purchase binoculars with 10x, 15x, or even 20x magnification. The 10x50 model is one of the most commonly used by amateurs (objects up to magnitude 10 can be seen!). It is recommended that the objective aperture be no smaller than 35mm, but for objectives larger than 100mm it is necessary to mount the binoculars on a tripod or stand due to their weight.<\/p>\n

<\/p>\n

exit pupil<\/strong><\/p>\n

\"Pupila<\/p>\n

When you divide the diameter by the magnification you get a value called the exit pupil, which is the width of the beam of light that leaves the binoculars through the eyepieces (those small lenses through which you observe) passing through the observer's pupil. For "10 x 50" binoculars the exit pupil would be 5 mm (50\/10=5). The important thing here is that if the exit pupil is greater than the observer's pupil dilation, there will be a percentage of wasted light that will not reach our retina. Since an observer's pupil commonly opens about 5 mm in dark sky conditions, it is recommended that the exit pupil of the binoculars measure between 2.5 and 5 mm.<\/p>\n

Field of view<\/strong><\/p>\n

\"Campo<\/p>\n

On many binoculars you will find something like \u201c80 m or 1000 m\u201d, which is the width we see in a view from 1000 m. To observe the sky with binoculars we will have a field of view expressed in degrees. 1\u00ba (one degree) is the equivalent of 2 times the diameter of the full moon. 7\u00ba of real field is equivalent to 14 full moons. The models with the highest magnification have between 3\u00ba and 5\u00ba, the models with a wide field (wide angle) can have 8\u00ba or 10\u00ba. In any case, the objects that will be within our reach with a typical field of view of binoculars are: star clusters (open and closed), nebulae, comets, bright galaxies, planets, the Moon and the Sun (with the appropriate filters for the case, or better still, using the projection technique).<\/p>\n

<\/p>\n

Anti-reflective coatings<\/strong><\/p>\n

The binoculars have an anti-reflective coating made of magnesium fluoride which gives the lenses a bluish tint. The coatings increase transmission, reduce the scattering of light reaching the lenses and increase brightness and contrast. In older models and in cheaper models only the external parts are anti-reflective coated, these models will have many reflections and light loss. It is very important to pay attention to this detail, as reflections significantly impair observations.<\/p>\n

Techniques when purchasing them<\/strong><\/p>\n

To test them, separate both tubes until you see a single disk with both eyes. Normally one of the tubes has an eyepiece with numbers that is to compensate for the differences between one eye and the other (usually the right one). Close your right eye and focus the binocular with your left sight (focusing is done with a wheel in the part that joins the two tubes), when the image is clear, close your left eye and observing with your right eye find the focus by rotating only the eyepiece, ready?, open both eyes.<\/p>\n

Advantages and disadvantages<\/strong><\/p>\n

Advantages<\/strong>
\n\u2013 They are economical
\n\u2013 Easy and comfortable to use
\n\u2013 They do not require much maintenance
\n\u2013 Allows you to find objects quickly<\/em><\/p>\n

Disadvantages<\/strong>
\n\u2013 They may suffer from a \u201cfield curvature\u201d effect that distorts part of the image
\n\u2013 Most do not have the possibility of interchangeable eyepieces
\n\u2013 In openings beyond 50 mm they become too heavy to hold firmly<\/em>
\n<\/em><\/p>","protected":false},"excerpt":{"rendered":"

Binoculars are small refracting telescopes, which have a built-in prism system to shorten the support tube and avoid inverted vision. They have less magnification capacity than a telescope, but they have a greater field of view. To prevent vibrations, it is advisable to fix them to a photographic tripod. They are classified by the degree of increase\u2026<\/p>","protected":false},"author":1,"featured_media":6993,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","footnotes":""},"categories":[43],"tags":[],"class_list":["post-1148","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-instrumental"],"magazineBlocksPostFeaturedMedia":{"thumbnail":"https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/binoculars-banner-150x150.jpg","medium":"https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/binoculars-banner-300x200.jpg","medium_large":"https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/binoculars-banner-768x512.jpg","large":"https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/binoculars-banner-1024x683.jpg","1536x1536":"https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/binoculars-banner.jpg","2048x2048":"https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/binoculars-banner.jpg","trp-custom-language-flag":"https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/binoculars-banner.jpg"},"magazineBlocksPostAuthor":{"name":"Farid","avatar":"https:\/\/secure.gravatar.com\/avatar\/57e8aa07b0d16e13c8408ea413c009fc7da05f4cbb36da0d568b4235b1eaee6b?s=96&r=g"},"magazineBlocksPostCommentsNumber":false,"magazineBlocksPostExcerpt":"Los binoculares son peque\u00f1os telescopios refractores, que tienen incorporado un sistema de prismas para acortar el tubo de soporte y evitar la visi\u00f3n invertida. Tienen menor capacidad de aumento que un telescopio, pero tienen mayor campo de visi\u00f3n. Para impedir las vibraciones, conviene fijarlos a un tr\u00edpode fotogr\u00e1fico. Se clasifican por el grado de aumento…","magazineBlocksPostCategories":["Instrumental"],"magazineBlocksPostViewCount":1376,"magazineBlocksPostReadTime":5,"magazine_blocks_featured_image_url":{"full":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/binoculars-banner.jpg",1200,800,false],"medium":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/binoculars-banner-300x200.jpg",300,200,true],"thumbnail":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/binoculars-banner-150x150.jpg",150,150,true]},"magazine_blocks_author":{"display_name":"Farid","author_link":"https:\/\/austrinus.com\/en\/author\/farid\/"},"magazine_blocks_comment":0,"magazine_blocks_author_image":"https:\/\/secure.gravatar.com\/avatar\/57e8aa07b0d16e13c8408ea413c009fc7da05f4cbb36da0d568b4235b1eaee6b?s=96&r=g","magazine_blocks_category":"Instrumental<\/a>","uagb_featured_image_src":{"full":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/binoculars-banner.jpg",1200,800,false],"thumbnail":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/binoculars-banner-150x150.jpg",150,150,true],"medium":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/binoculars-banner-300x200.jpg",300,200,true],"medium_large":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/binoculars-banner-768x512.jpg",640,427,true],"large":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/binoculars-banner-1024x683.jpg",640,427,true],"1536x1536":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/binoculars-banner.jpg",1200,800,false],"2048x2048":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/binoculars-banner.jpg",1200,800,false],"trp-custom-language-flag":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/binoculars-banner.jpg",18,12,false]},"uagb_author_info":{"display_name":"Farid","author_link":"https:\/\/austrinus.com\/en\/author\/farid\/"},"uagb_comment_info":0,"uagb_excerpt":"Los binoculares son peque\u00f1os telescopios refractores, que tienen incorporado un sistema de prismas para acortar el tubo de soporte y evitar la visi\u00f3n invertida. Tienen menor capacidad de aumento que un telescopio, pero tienen mayor campo de visi\u00f3n. Para impedir las vibraciones, conviene fijarlos a un tr\u00edpode fotogr\u00e1fico. Se clasifican por el grado de aumento…","_links":{"self":[{"href":"https:\/\/austrinus.com\/en\/wp-json\/wp\/v2\/posts\/1148","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/austrinus.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/austrinus.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/austrinus.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/austrinus.com\/en\/wp-json\/wp\/v2\/comments?post=1148"}],"version-history":[{"count":2,"href":"https:\/\/austrinus.com\/en\/wp-json\/wp\/v2\/posts\/1148\/revisions"}],"predecessor-version":[{"id":6994,"href":"https:\/\/austrinus.com\/en\/wp-json\/wp\/v2\/posts\/1148\/revisions\/6994"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/austrinus.com\/en\/wp-json\/wp\/v2\/media\/6993"}],"wp:attachment":[{"href":"https:\/\/austrinus.com\/en\/wp-json\/wp\/v2\/media?parent=1148"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/austrinus.com\/en\/wp-json\/wp\/v2\/categories?post=1148"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/austrinus.com\/en\/wp-json\/wp\/v2\/tags?post=1148"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}