In addition to the relatively compact design, reflector optical tubes are also lightweight for their size. Typically, the reflecting telescope allows for larger apertures. The reflector optical design, like other catadioptrics, utilizes a system of lenses and mirrors to produce long focal lengths with a more compact tube length than refractors. This 6" reflecting optical tube features a 750mm focal length using a tube less than 2.5 ft long. The invention of the reflector telescope stretches back to Isaac Newton in the 17th Century. The Newtonian optical design is simple to set up, and gives amateur astronomers the largest aperture for the price. For those new to astronomy and astroimaging, the Advanced VX 6” Newtonian is an excellent entry-level scope that can grow with you. With the fast focal ratio of f/5, wide screen views through this 6" Newtonian are especially impressive when observing brighter deep sky objects like the Orion Nebula ( M42), Hercules Cluster ( M13), and Andromeda Galaxy ( M31). That being said, once tuned in, the light-soaking power of that fast 8 mirror is hard to ignore. With the parabolic primary mirror, aberration is limited which helps create high definition views. The process of constantly collimating a Newtonian reflector is a big reason I generally prefer to use my apochromatic refractor. Later, telescopes with convex eyepieces appeared instead of concave eyepieces. Galileo was the first astronomer to observe the stars with his telescope. The telescope consists of a convex objective and a concave eyepiece. The Celestron Advanced VX 6" Newtonian Telescope Optical Tube is excellent for basic deep sky observing as well as planetary viewing due to the impressive light gathering power of the Newtonian Optical Design and Fast Focal Ratio. The Galilean telescope is often referred to as a terrestrial telescope. Lightweight and easy to use, this Newtonian comes ready to go out of the box with a dual-speed 2' linear bearing Crayford-style linear bearing focuser, dual split-hinged mounting rings, and a Vixen style dovetail plate. 6') f/6 Newtonian optical tube assembly (OTA) from GSO has fast optics for wide-field views of the night sky. Angle Adjusters, Adaptive Optics & Field De-RotatorsĬELESTRON - Advanced VX 6" Newtonian Telescope (32054-OTA) This compact and affordable 150mm (approx.Batteries, Power Supplies & Power Cables.