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Formulas - Telescope Magnification
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Thiery Legault - How to adjust the focal length ?
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Telescope Equations
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![ASTR 3130, Majewski [SPRING 2019]. Lecture Notes](https://faculty.virginia.edu/ASTR3130/lectures/telescopes/mag3.gif "ASTR 3130, Majewski [SPRING 2019]. Lecture Notes")