This calculator requires the use of Javascript enabled and capable browsers. This calculator is designed to give the operating characteristics for a given telescope, based on the data entered for the scope's operating specifications. Enter the values for the telescope's aperture in either millimeters or inches; also enter the lens' focal ratio or focal length. Enter the eyepiece size in millimeters, the apparent field of vision in degrees and the Barlow Lens factor. Click on Calculate for the scope's vital information.
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