{"id":1205,"date":"2014-12-11T17:34:52","date_gmt":"2014-12-11T17:34:52","guid":{"rendered":"http:\/\/dev.austrinus.com\/?p=1205"},"modified":"2022-11-24T00:41:16","modified_gmt":"2022-11-24T03:41:16","slug":"accesorios","status":"publish","type":"post","link":"https:\/\/austrinus.com\/en\/accesorios\/","title":{"rendered":"Accessories"},"content":{"rendered":"

\"\"When one enters into amateur astronomy through the use of instruments, it is always advisable to have some accessories. Some are not too important, while others are essential to make a good observation. The most used accessories in astronomy and their respective characteristics are detailed below.<\/p>\n

Eyepieces<\/strong>: They are the fundamental accessory for carrying out telescope observations, since it is where the image that one will see with their eyes is formed. Telescopes usually include an eyepiece by default, usually 20 or 25 mm, but the amateur quickly realizes that he will need at least one or two more to have observations covering various types of objects.<\/p>\n

\"Diferencias
Differences in the field of vision when varying the focal length of an eyepiece. Credit: Randy Culp<\/figcaption><\/figure>\n

This is because each eyepiece has a different magnification, and each one offers a different field of vision. A low magnification (35-50x) gives a wider field of view, obtaining good panoramic views and faint deep-sky objects; medium magnification (80-120x) is ideal for open clusters or viewing the entire disk of the Moon; High magnifications (150-200x) excel for lunar details, double stars, and deep-sky objects.<\/p>\n

Eyepieces are sold by their focal length, not magnification. Focal lengths are expressed in millimeters; Examples: 6mm, 10mm, 20mm, 32mm, etc. The smaller the focal length of the eyepiece, the greater the magnification and, at the same time, a smaller field of view.<\/p>\n

<\/p>\n

Types of eyepieces<\/strong><\/p>\n

Huygens<\/strong>: It is made up of 2 lenses and is very common in beginner telescopes, as they are not of good quality. Provides an apparent field between 25\u00b0 to 40\u00b0.<\/p>\n

Ramsden<\/strong>: Somewhat superior to Huygens, but it is not of good quality either. It is also made up of 2 lenses and its apparent field reaches between 30\u00b0 to 40\u00b0.<\/p>\n

Kellner type I<\/strong>: This eyepiece is composed of simple achromatic lenses. It is a plano-convex type lens. Its apparent field of vision ranges between 35\u00ba to 50\u00ba and has better color correction.<\/p>\n

Kellner type II<\/strong>: This eyepiece is also composed of simple achromatic lenses and has the same apparent field as the Kellner type I. Its main difference is that it is a double plano-convex type lens.<\/p>\n

Pl\u00f6ssl (Kellner type III):<\/strong>\u00a0One of the most popular and finest eyepieces for amateurs. It consists of two achromatic lenses and provides an apparent field of vision between 35\u00b0 to 50\u00b0.<\/p>\n

Orthoscopic<\/strong>: An excellent type of eyepiece, composed of 4 lenses with a triplet. Their apparent field is between 35\u00b0 to 50\u00b0, and they are commonly associated with Abbe eyepieces.<\/p>\n

Erfle<\/strong>: Eyepiece with a very wide apparent field, between 50\u00ba and 70\u00ba. It consists of 3 achromatic lenses and good definition, but suffers from some aberrations at the edges.<\/p>\n

nagler<\/strong>: One of the most prestigious eyepieces, and also one of the most expensive. It consists of an apparent field that can reach 82\u00b0, extremely wide, specially designed to work in Newtonian telescopes. It is a seven-element design with field-flattening lenses and great ocular relief, with very sharp and contrasted views.<\/p>\n

<\/p>\n

Telescope accessories<\/strong><\/p>\n

\"\"Barlow<\/strong><\/span>: It is a complementary accessory to the eyepieces. They are composed of a negative lens that elongates the image plane in a telescope, so it can double (2x) or triple (3x) the image, although the higher magnifications are used, the blurrier the image will become.<\/p>\n

The Barlows therefore, what they do is raise the focal length of the telescope.<\/p>\n

\"\"focal reducer<\/strong><\/span>: It is like a Barlow lens but in reverse, since its function is to shorten the focal length of the telescope and obtain an image that is smaller than the original.<\/p>\n

This system is used when looking to create a wider field, generally for panoramic astrophotography. It involves a loss of resolution, but is very useful for photographing events such as eclipses.<\/p>\n

\"\"Diagonal<\/strong><\/span>: It is a structure that is attached to the eyepiece holder, precisely with a diagonal shape, where there is a flat mirror inside that bounces the light to reach the eyepiece located at the other end.<\/p>\n

It is a solution that facilitates viewing, particularly for very high objects that would be very difficult or sometimes impossible to see when the telescope tube is completely perpendicular to the ground.<\/p>\n

\"\"Reticulated eyepiece<\/strong><\/span>: It is an especially useful accessory in long exposure astrophotography. The reticle included in the eyepiece helps to keep an object centered in the field of view, keeping another object within the field as a reference.<\/p>\n

Some also have the option that the reticle is illuminated, making it much easier for us to appreciate the crosshair that is used as a reference.<\/p>\n

\"\"Filters<\/strong><\/span>: They are accessories that come before the eyepiece, with the aim of highlighting certain characteristics that you want to see in a particular object.<\/p>\n

exist\u00a0planetary filters<\/strong>\u00a0of colors, each with different characteristics to enhance, such as increasing the contrast of Jupiter's cloud bands, darkening or lightening areas of Mars, clarifying the Cassini division on Saturn, seeing the red spot more precisely, etc. The job of these filters is to absorb certain wavelengths and let others pass through, something very useful to see the planets in maximum detail.<\/p>\n

<\/p>\n

\"\"Also exist\u00a0lunar filters<\/strong><\/span>, these act by absorbing the excessive luminosity of the satellite to allow us to better appreciate the characteristics of the surface, such as craters and seas. Lunar filters give a coloration\u00a0greenish<\/em>\u00a0to the moon. On the other hand there are\u00a0sun filters<\/strong><\/span>, designed to prevent the passage of excessive radiation and thus be able to safely contemplate our star. The best known in this category is the filter\u00a0alpha hydrogen<\/em>\u00a0(H-alpha), which allows only a narrow band of radiation to pass through.<\/p>\n

\"\"The\u00a0deep space filters<\/strong><\/span>, such as Oxygen III, allow better observation of planetary and emission nebulae; a Hydrogen Beta (H-Beta) improves the view of emission nebulae (e.g. Horsehead nebula in Orion); an Ultra High Contrast (UHC) is useful for planetary and emission nebulae; They all fulfill the function of letting through and absorbing certain wavelengths that enhance our objective.<\/p>\n

Additionally there are\u00a0variable polarized filters<\/strong><\/span>, which allow us to control the amount of light we receive, as they are composed of two polarized filters in a rotating cell, where the brightness can be controlled between 1% to 40%. It is often used as a replacement for the lunar filter and to separate nearby binary systems.<\/p>\n

\"\"Finally, there are type filters\u00a0CLS<\/strong><\/span>\u00a0(City Light Suppressor<\/em>) either\u00a0LPR<\/strong><\/span>\u00a0(Light Pollution Reducer<\/em>), which eliminate part of the\u00a0Light pollution<\/em>\u00a0that comes from our own observation site, since they absorb the wavelengths of mercury and sodium, since most lighting systems are based on aluminum luminaires.\u00a0Mercury Vapor<\/em>\u00a0either\u00a0High and low pressure sodium<\/em>.<\/p>\n

<\/p>\n

Hobbyist accessories<\/strong><\/p>\n

\"\"star chart<\/strong>: A very useful complement for any outing, of more or less variable need depending on the experience of the fan or if there is a scheduled itinerary.<\/p>\n

Star charts can be obtained from astronomy software, from websites dedicated to highlighting specific phenomena, such as passages of comets or asteroids, or from a portable planisphere (also called a "planisphere").star wheel<\/em>\u00ab), which contains the entire celestial vault, and only needs to be rotated to match a date and time during the year.<\/p>\n

\"\"red lantern<\/strong>: It is the only suitable means of lighting during an astronomical observation, for purposes such as illuminating a map or notebook, since the red light prevents one from becoming dazzled and losing sensitivity to light in a dark sky, which does occur. , would require us to allow about 15 minutes for our eyes to get used to the darkness again.<\/p>\n

A conventional flashlight lined with red cellophane can also be used.<\/p>\n

\"\"green laser<\/strong>: It is a device the size of a pen, similar to common red light laser pointers, but with the difference that it sends a very powerful light beam, with an average range of 2 km. This allows the laser to be projected into the sky to locate and show the constellations. The luminosity and range depend on atmospheric conditions, but in general it is very useful for aiming celestial objects.<\/p>","protected":false},"excerpt":{"rendered":"

When one enters into amateur astronomy through the use of instruments, it is always advisable to have some accessories. Some are not too important, while others are essential to make a good observation. The most used accessories in astronomy and their respective characteristics are detailed below. Eyepieces: They are the essential accessory for\u2026<\/p>","protected":false},"author":1,"featured_media":6995,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","footnotes":""},"categories":[43],"tags":[],"class_list":["post-1205","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-instrumental"],"magazineBlocksPostFeaturedMedia":{"thumbnail":"https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/accesories-banner-150x150.jpg","medium":"https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/accesories-banner-300x200.jpg","medium_large":"https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/accesories-banner-768x512.jpg","large":"https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/accesories-banner-1024x683.jpg","1536x1536":"https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/accesories-banner.jpg","2048x2048":"https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/accesories-banner.jpg","trp-custom-language-flag":"https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/accesories-banner.jpg"},"magazineBlocksPostAuthor":{"name":"Farid","avatar":"https:\/\/secure.gravatar.com\/avatar\/57e8aa07b0d16e13c8408ea413c009fc7da05f4cbb36da0d568b4235b1eaee6b?s=96&r=g"},"magazineBlocksPostCommentsNumber":false,"magazineBlocksPostExcerpt":"Cuando uno se interna en astronom\u00eda aficionada mediante el uso de instrumental, siempre es recomendable contar con algunos accesorios. Algunos no son demasiado importantes, mientras que otros s\u00ed son fundamentales para realizar una buena observaci\u00f3n. A continuaci\u00f3n se detallan los accesorios m\u00e1s usados en astronom\u00eda y sus respectivas caracter\u00edsticas. Oculares: Son el accesorio fundamental para…","magazineBlocksPostCategories":["Instrumental"],"magazineBlocksPostViewCount":3095,"magazineBlocksPostReadTime":8,"magazine_blocks_featured_image_url":{"full":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/accesories-banner.jpg",1200,800,false],"medium":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/accesories-banner-300x200.jpg",300,200,true],"thumbnail":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/accesories-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\/accesories-banner.jpg",1200,800,false],"thumbnail":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/accesories-banner-150x150.jpg",150,150,true],"medium":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/accesories-banner-300x200.jpg",300,200,true],"medium_large":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/accesories-banner-768x512.jpg",640,427,true],"large":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/accesories-banner-1024x683.jpg",640,427,true],"1536x1536":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/accesories-banner.jpg",1200,800,false],"2048x2048":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/accesories-banner.jpg",1200,800,false],"trp-custom-language-flag":["https:\/\/austrinus.com\/wp-content\/uploads\/2014\/12\/accesories-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":"Cuando uno se interna en astronom\u00eda aficionada mediante el uso de instrumental, siempre es recomendable contar con algunos accesorios. Algunos no son demasiado importantes, mientras que otros s\u00ed son fundamentales para realizar una buena observaci\u00f3n. A continuaci\u00f3n se detallan los accesorios m\u00e1s usados en astronom\u00eda y sus respectivas caracter\u00edsticas. Oculares: Son el accesorio fundamental para…","_links":{"self":[{"href":"https:\/\/austrinus.com\/en\/wp-json\/wp\/v2\/posts\/1205","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=1205"}],"version-history":[{"count":2,"href":"https:\/\/austrinus.com\/en\/wp-json\/wp\/v2\/posts\/1205\/revisions"}],"predecessor-version":[{"id":7009,"href":"https:\/\/austrinus.com\/en\/wp-json\/wp\/v2\/posts\/1205\/revisions\/7009"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/austrinus.com\/en\/wp-json\/wp\/v2\/media\/6995"}],"wp:attachment":[{"href":"https:\/\/austrinus.com\/en\/wp-json\/wp\/v2\/media?parent=1205"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/austrinus.com\/en\/wp-json\/wp\/v2\/categories?post=1205"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/austrinus.com\/en\/wp-json\/wp\/v2\/tags?post=1205"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}