Specification:Optical Design ED Apochromatic Quad Element Refractor Aperture 103 mm (4") Focal Length 825mm Focal Ratio f/8.0 Coating Multi Coating Resolving Power 1.13 arc sec Limiting Magnitude 11.8 Light Gathering Power 217x Finder Scope Optional Adapter Thread 60mm/50.8mm Astrophotography Prime Focus, Eyepiece Projection and Afocal Imaging Outside Dew Shield Diameter 140mm Visual Back Compression Ring Optical Tube Length 27 (690mm) Optical Tube Diameter 4. Includes 7x50 finder,dovetail, tube rings, carry handle, and flip mirror. Manufactured in Japan and covered by a 5 Year Warranty. Sky at Night Magazine states: "With its excellent build quality and rich feature set, we thoroughly recommend this system if you are looking to upgrade from your current setup". The related products of refracting telescope lens: Objective lens for better light and image quality than your original. The most common design of refractors is known as a 'doublet' wherein two lenses are mounted surface-to-surface inside a confining ring called a cell. Astronomy Magazine states "Its superb optics allow high magnification views". In a refracting telescope the 'objective' is that lens which gathers light and brings it to a focus. "Precision Multi-Coating" applied to the lenses, assures high light transmission. The refractor is the classic telescope design that most people are familiar with: A long thin tube that points to the sky with a focuser at the bottom end. In combination with the rear Field Corrector Lens, the AX103 Refractor yields clear images to the edges of the field of view. This reduces chromatic aberration and yields high contrast images. Look through the eyepiece of your telescope and focus it on a distant object. You have now assembled a simple refracting telescope. The 36-inch refractor was fabricated at the. In 1668 Isaac Newton invented the reflecting telescope, which used mirrors instead of lenses. Glue the other framed lens to the end of the larger tube. Great Lick Refractor Lens Lick Observatory was built during the years 1880 through 1888. Glue that framed lens to the end of the smaller tube. In 1668 Isaac Newton invented the reflecting telescope, which used mirrors instead of lenses. The shorter focal length lens will be the eyepiece. A simple lens like this acts like a prism, dispersing the colors that make up white light, and shows much false color. Vixen' s NEW AX103S, f/8.0 Refractor features a three element objective lens, incorporating a central ED lens. In 1609 Galileo first used a telescope with a simple, one-element objective to view the heavens.
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