Wood, leather, and glass

Here are awe-inspiring pictures of Galileo’s 17th century astronomy equipment from http://www.theguardian.com/science/gallery/2009/mar/12/galileo-exhibition-florence-strozzi?picture=344506960:

A lens made by Galileo circa 1609, with ivory / ebony frame by Vittorio Crosten from 1677.
Wood and leather telescope made by Galileo circa 1609 with which he observed the Earth’s moon, the phases of the planet Venus, and the most prominent moons of Jupiter.
Enlarged photograph of the telescope’s eyepiece.