Hubble Optics Telescopio Dobson N 457/2058 UL18 f/4.5 Premium Ultra Light DOB

La descripción de este producto no está disponible en español. Esperamos que la versión en inglés le sea de utilidad. En cualquier caso, sentimos las molestias. - A high-quality, large-aperture telescope optimized in a very light and compact package for extreme portability! The UL18 is a telescope big enough to give satisfying views for a serious observer, yet still easily transportable to dark sky locations by one person. The Hubble Optics UL18 not only delivers the premium optical experience you need to seriously explore our universe, but tipping the scales at only about 72 lbs it's one third of the weight of classical Dobsonian telescope and folded into a compact package that will fit in any car. - The UL18 is a perfect balance between a telescope with huge light-gathering capability and unbeatable portability. It will be the telescope that gets taken out of the garage or from the back of a car to be used frequently. It will provide stunning views of the heavens and a lifetime of observing enjoyment. - The UL18 has a parabolic primary with a full 18-inch diameter of optical surface, a generous 18.4” overall diameter; not an 18-inch blank with a beveled and much smaller optical surface, which is about 5% more optical surface and light gathering than any other 18” scopes in the market. In addition, with its fast focal ratio mirror, the Hubble UL18 telescope has an eyepiece location that can almost always be reached when you are standing with both feet on the ground (only 68'' from the ground when the UL18 is pointed at zenith). The Hubble UL18 is a telescope that can provide a lifetime of satisfying observing experiences in a 72-pound package! There are two versions of the UL18: f/4 and f/4.5Advantages of f/4.5:Sharper images. No need for a coma corrector at all. - Smaller central obstruction - Easier to achieve perfect collimation - Advantages of f/4:No ladder is needed for most people; while you may need one-step ladder for an f/4.5 when close to zenith direction. - Wider field of view - Both f/4 and f/4.5 will provide you the excellent views. The f/4.5 provides the perfect view for the most demanding observer, without coma corrector. A coma corrector is strongly recommended for the UL18 f/4. Please note that some counter weight will be required for f/4.5 at the bottom, which is NOT provided. - Some Features:Exclusive Sandwich Mirror Technology: Hubble optics sandwich mirror technology has been used to manufacture research-grade optical elements and proven by over a half dozen years of successful applications at research facilities such as NASA, California State Polytechnic University San Luis Obispo, for the US Army, and in amateur telescopes around the world. Hubble sandwich mirror’s open core and close back design not only allows air to circulate through the mirror, but also provide the maximum structure strength to allow a simpler mirror cell design. Why is thermal equilibrium so critical? The main issue is ''mirror seeing,'' the turbulence seen through the eyepiece of the telescope when the air above the mirror is different from the mirror itself. Since a sandwich mirror cools far more rapidly than a solid mirror of the same thickness, this major source of distortion is eliminated quickly, giving you sharp and stable views. - Semi-Enhanced Optical Coatings: The primary mirror is coated with the most recommended (by professionals) 92% Semi-Enhanced optical coatings to assure it collects as many (while scattering as little) photons as possible to focus it into a bright and contrast-rich image. The optimal 92% Semi-enhanced coating has an over-coating of precision controlled dielectric layer to maximize the reflectivity and provide excellent chemical and mechanical protection for the mirror coating. A 96% enhanced optical coating is applied on the secondary mirror. - Engineered Mirror Support: The Dobson has an extensively modeled and optimized flotation system that provides more than adequate support for the sandwich mirror. The three-point coll