The edge support configurations have been selected after extensive discussions and represent the state-of-the-art ideas about the edge support in mirror cells for Dobsonian telescopes from a number of … The Newtonian Telescope Design Planner uses "JavaScript" to perform the mathematical calculations; therefore, your browser must be "JavaScript" compatible and enabled. f/ Please select one of 458 telescopes from the drop-down box, or use Manual mode to enter the aperture and focal length by … Tele Vue Optics, founded in 1977, has been thrilling amateur astronomers since 1979. Two versions of the planner … Aperture: mm. Focal Length Calculator. It's in the materials we choose, the designs we create, the craftsmanship we demonstrate...the images … High powers are useful for detecting faint stars, use up to 50X or 75X per inch if seeing conditions permit. Focal Ratio Calculator. It is our mission. Calculate the focal length of your telescope. Telescope Aperture The diameter of the objective lens or mirror. Power The power of the telescope, computed as focal length of the telescope divided by the focal length of the eyepiece. X Focal Ratio: f/ = Focal Length: mm. Calculate the focal ratio of your telescope… Telescope Calculator ... Focal Ratio Please enter the focal ratio of your telescope. Type of telescope Focal Length & Ratio Useful calculators and formulae. Formula: Aperture X Focal Ratio .
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