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Scope Calculator

This MS Excel spreadsheet allows you to store and calculate the vital statistics of your telescope and eyepieces.  For the telescope it includes calculations for maximum resolution, maximum field of view and maximum magnification.   For each eyepiece it calculates true field of view and magnification.  Also allows for up to two different barlows.  Requires MS Excel 97 or later.  If you do not have Excel, but want to use the Scope Calculator, try Google Sheets (search at or Open Office (

Click here to download

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Michael Swanson
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