{"id":22449,"date":"2021-12-20T21:49:08","date_gmt":"2021-12-20T21:49:08","guid":{"rendered":"https:\/\/amt.ee\/product\/sky-watcher-telescope-ac-90-900-evostar-eq-2\/"},"modified":"2022-11-17T10:46:02","modified_gmt":"2022-11-17T10:46:02","slug":"sky-watcher-telescope-ac-90-900-evostar-eq-2","status":"publish","type":"product","link":"https:\/\/amt.ee\/ru\/product\/sky-watcher-telescope-ac-90-900-evostar-eq-2\/","title":{"rendered":"Sky-Watcher 90\/900 EvoStar EQ-2 \u0422\u0435\u043b\u0435\u0441\u043a\u043e\u043f"},"content":{"rendered":"

The lenticular telescope designed for beginner astronomy enthusiasts. With a diameter of 90mm, it is a telescope that offers greater possibilities than the basic models with a diameter of 60mm or 70mm.\u00a0The greater stellar range and better resolution allow you to see more objects with better image quality.\u00a0It is a telescope with f \/ 10 aperture and a focal length of 900mm.\u00a0The tube is suspended on the EQ2 equatorial mount, this mount allows for convenient manual tracking of objects (it is also possible to mount an optional electric drive).\u00a0Equipped with a 1.25 «prism cap, it allows you to obtain a non-inverted terrestrial image.<\/strong><\/p>\n

Optical system<\/strong><\/p>\n

The BK909EQ2 telescope is a classic achromatic refractor.\u00a0The lens diameter is 90mm and the focal length is 900mm.\u00a0The aperture of the lens is equal to f \/ 10.\u00a0It is a typical achromatic doublet made of two elements with different refractive indexes, covered with anti-reflective coatings.\u00a0On the side of the eyepiece lens, in the optical axis, there is a 45-degree prismatic cap that gives an inverted image and 2 Kellner eyepieces with 10mm and 25mm focal lengths.\u00a0The telescope’s equipment should be supplemented with two eyepieces: short-focus (6-7mm) for the Moon and planets, and another with a focal length of approx. 40mm in order to obtain a wider field of view and greater image clarity.<\/p>\n

Installation<\/strong><\/p>\n

The telescope is suspended on the EQ2 equatorial mount.\u00a0It is a structure slightly stronger and heavier than the basic EQ1 mount, guaranteeing good stability for a telescope of this size.\u00a0The parallactic mount is a structure typically intended for astronomical observations.\u00a0The axes of the mount are tilted in such a way that one of the axes points to the blue pole, near the Pole Star.\u00a0When properly positioned, objects in the sky move across the field of view in a way that allows them to be tracked in one axis without the need to make corrections in the other plane.<\/p>\n

Two types of drives that allow tracking the blue sphere can be connected to the assembly.\u00a0The first of them with a lower precision is the so-called\u00a0economic drive for the EQ2, the second, much more precise and possible, is the drive in one axis for mounting the EQ2.<\/strong><\/p>\n

Astronomical observations<\/strong><\/p>\n

Solar system:<\/p>\n

Sunspots (with an appropriate filter), details on the lunar surface — larger than 2 km, stripes in the atmosphere of Jupiter, shadows of the moons on the planet during transits, Cassini’s break in the rings of Saturn, in good conditions 4-5 moons of this planet.\u00a0Uranus visible as a tiny disk at high magnification, Neptune as a point object.<\/p>\n

Celebrities:<\/p>\n

About 1.1 million stars across the sky, up to about magnitude 11.5-12, binary and multiple stars separated by more than 1.5 «angularly.<\/p>\n

Deep Sky Objects:<\/p>\n

Dozens of globular clusters, emission nebulae, planetary nebulae and galaxies, all Messier objects and brighter NGC objects (with many brighter objects visible detail) most of the galaxies remain blurry.<\/p>\n