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Engraving depicting the arrangement of lenses in Johannes Kepler's telescope. This had two double convex lenses and gave a wider field of view. Johannes Kepler (1571-1630) a German mathematician, astronomer, and astrologer.
Engraving depicting a refracting telescope on an iron stand and fitted with a finder. The instrument has two double convex lenses and is known as the astronomical telescope. Dated 19th Century Stock
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