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

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