One of the most popular astronomical telescopes in its price range. BK909EQ2 is a 90 millimeter achromatic refractor installed on a EQ2 equatorial mount. The capabilities of this telescope in regard to its price are quite substantial. At a diameter of 90 mm it is a telescope that can manage a little more than standard models with a diameter of 70 mm. An increased star magnitude limit and better resolution allow for noticing of more objects with better image quality. It is a telescope with focal ratio of f/10 and a focal length of 900 mm. It is equipped with a 6x30 finder scope that is comfortable to use and worth recommending especially to younger observers that value comfort and ease of use. The tube is installed on a EQ2 equatorial mount. This mount allows for comfortable tracking of objects (it is also possible to mount an optional electric drive).
BK909EQ2 telescope is a classic achromatic refractor. It is equipped with a 90 mm in diameter and 900 mm focal length lens eyepiece. The focal ration equals to f/10. It is a typical achromatic double made of two elements with various refractive indexes, covered with anti-reflective coatings. From the focuser, in the optical axis, is a 90 degrees diagonal mirror, 2 Kellner eyepieces with a focal length of 10 mm and 25 mm as well as a Barlow lens.
The telescope is installed on a EQ2 equatorial mount. It is a construction slightly sturdier and heavier than a basic EQ1 mount, guaranteeing a good stability in the case of a telescope of this size. An equatorial mount is a construction intended typical for astronomical observation. Mount axes are inclined in such a way so that one of the axes is directed towards the celestial pole, near the Polar star. When correctly set, objects in the sky move in the field of view in a way that allows for their tracking within one axis, without having to make corrections in the second axis. Two types of motors allowing for the tracking of the celestial sphere can be connected to the mount. The first one, with a lower precision is a so-called economic drive for EQ2. The second one, much more precise and with greater capabilities, is a single axis drive for EQ2 mount.
The telescope is equipped with a focuser in a 1.25” standard. It is a gear focuser (so-called Rack&Pinion focuser). This focuser has a mount with a mounting screw for a diagonal mirror at its end. A 90 degrees diagonal mirror in a 1.25” standard is included in the set. The focuser is compatible with drives for Sky-Watcher focusers.
The structure of sunspots (with an appropriate filter), small creations on the Moon - larger than 2 km, additional belts on Jupiter, subtle details on the belts, moon shadows on a planet during a transition, Cassini division in Saturn’s rings, in good conditions 4-5 moons of that planet. Uranus is visible as a small shield in large magnification, Neptune as a dot.
Around 1.1 mln stars in the whole sky, with a star magnitude limit of 11.5 - 12, double and multiple stars separated from each other diagonally no more than 1.5”.
Dozens of globular clusters, emission nebulas, planetary nebulas and galaxies, all Messier objects and brighter NGC objects (details visible in many of the brighter objects) majority of galaxies continue to remain blurry spots.
The set includes:
- 1.25” - Super 25, Super 10 eyepiece
- 6x30 finder scope
- 90o 1.25” diagonal mirror
- achromatic Barlow 2x 1.25” lens