| 11. | In amateur astrophotography, a Bahtinov mask can be used to focus small astronomical telescopes accurately.
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| 12. | This novel astronomical telescope has been assigned the duty of detecting cosmic neutrinos and their source.
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| 13. | Binoculars are widely used by amateur telescope makers, essentially using two refracting or reflecting astronomical telescopes.
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| 14. | He also manufactured eighty percent of all astronomical telescopes made in the United States at this time.
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| 15. | Astronomical telescopes gather light using curved mirrors.
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| 16. | It was also on that occasion, that he first had the opportunity to use an astronomical telescope.
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| 17. | Henry Lawson offered his collection of astronomical telescopes, but the project failed through lack of government funding.
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| 18. | These sights are also used on astronomical telescopes as finderscopes, to help aim the telescope at the desired object.
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| 19. | Photon detectors such as CCDs in astronomical telescopes, spectrometers, or very high-end digital cameras are often cooled by Peltier elements.
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| 20. | Early in the twenieth century the government funded the construction of one of the largest astronomical telescopes in the world.
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