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Martin Lewis on X: "@MadWorldEarth @optixwiz Get a telescope. With a bright star in the field, move the focus back & forth. The star image will be very small and disc-like at
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tacheometric surveying | PPT
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William Baum inside the prime focus cage of the 200-inch telescope, Palomar Observatory. - Photographs - Huntington Digital Library
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Star Testing Telescope Optics — Starizona
