The science museum in Florence has two telescopes and a single lens attributed to Galileo. Tests conducted with modern interferometric equipment show that Galileo was able to obtain nearly perfect optical quality.
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References
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Greco, V., Molesini, G. & Quercioli, F. Optical tests of Galileo's lenses. Nature 358, 101 (1992). https://doi.org/10.1038/358101a0
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DOI: https://doi.org/10.1038/358101a0
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