An Italian gunnery officer- Ignazio Porro (1801-1875) found a way to use the Keplerian binoculars and turn the picture over using prisms. A very important development occurred in the mid 19th century. Salva (1710-1762) invented the bridge that connected two small Galilean telescopes. In the mid 18th century a Venetian optician named D. This is the achromatic (color free) lens that is still in use today. Each lens was made from a different type of glass. He invented a lens made from two lenses cemented together. In 1758 John Dollond of England solved the main problem that plagued all binoculars till then- color aberration. In about 1617 Anton Schyrle (1597-1660), inserted an extra lens and the image was re-inverted it is called a terrestrial telescope. But, because they had two convex lenses the picture that was seen was inverted.
Johann Kepler (1571-1630) invented binoculars, which gave a much wider field of view. One year later Galileo Galilee (1564-1642), the Italian philosopher and mathematician improved the telescope to a magnification of X30. The first binoculars that were made of two parallel telescopes, were created in 1608 by the Dutch optician Hans Lipperhey.
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