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Freeware from Sky & Telescope

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Sec
Sample screen from Sec.

Sec

In the Telescope Techniques department in the August 2000 issue of Sky & Telescope (PDF of article), associate editor Gary Seronik and telescope maker Alan Adler discuss how to determine the optimal size of a secondary mirror for a Newtonian telescope. Adler provided a helpful DOS utility called Sec, which you can download here. Be sure to select "Save program to disk" when prompted.

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