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1. astronomy.tools › calculators › focal_length_ratioFocal Length & Ratio Useful calculators and formulae.

   astronomy.tools › calculators › focal_length_ratio

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   Focal Length Calculator. Calculate the focal length of your telescope. Formula: Aperture X Focal Ratio. Aperture: mm. X Focal Ratio: f/. = Focal Length: mm.

   • Magnification

     Magnification Calculator. Calculate the magnification of a...

2. skyandtelescope.org › observing › telescope-calculatorTelescope Calculator: How Does Your Telescope Perform?

   skyandtelescope.org › observing › telescope-calculator

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   31 sie 2017 · Focal Length: The distance (usually expressed in millimeters) from a mirror or lens to the image that it forms. In most telescopes the focal length is roughly equal to the length of the tube. Some telescopes use extra lenses and/or mirrors to create a long effective focal length in a short tube.

3. www.omnicalculator.com › physics › telescope-magnificationTelescope Magnification Calculator

   www.omnicalculator.com › physics › telescope-magnification

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   31 maj 2024 · Use this telescope magnification calculator to estimate the magnification, resolution, brightness, and other properties of the images taken by your scope.

4. astronomy.tools › calculators › magnificationMagnification Useful calculators and formulae. - astronomy.tools

   astronomy.tools › calculators › magnification

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   Magnification Calculator. Calculate the magnification of a telescope and eyepiece combination. Formula: Telescope Focal Length / Eyepiece Focal Length. Telescope Focal Length: mm. / Eyepiece Focal Length: mm. = Magnification: x.

5. stellafane.org › tm › atmStellafane ATM: Telescope Formulas and Calculator

   stellafane.org › tm › atm

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   You don't need to use the calculation feature - just scroll down the output table to find the formula you need. All variables used are always defined in rows nearer the top of the table. If you have measured a Sagitta (depth of Curve) and want to calculate Focal Length, use our Sagitta to Focal Length Calculator .

6. www.stargazing.net › naa › scopemathN.A.A. Telescope Math Calculator - Stargazing

   www.stargazing.net › naa › scopemath

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   Focal Length: The Effective Focal Length of your telescope is important to know; it is often listed on a label right on the telescope, sometimes as Fl, and usually in millimeters. It is equal to the Focal Ratio (f number) times the Objective Diameter.

7. telescope-calculator.co.ukTelescope Calculator

   telescope-calculator.co.uk

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   Focal Ratio Please enter the focal ratio of your telescope. f/ Please select one of 458 telescopes from the drop-down box, or use Manual mode to enter the aperture and focal length by hand.