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Cassegrain formulas.
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Optical system of a telescope
![ASTR 3130, Majewski [SPRING 2019]. Lecture Notes](https://faculty.virginia.edu/ASTR3130/lectures/telescopes/mag3.gif "ASTR 3130, Majewski [SPRING 2019]. Lecture Notes")
ASTR 3130, Majewski [SPRING 2019]. Lecture Notes
Optical system of a telescope
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How Fast is Your Telescope?
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