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History
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8×42 roof prism binoculars with rainguard and opened tethered lens caps
8×42 roof prism binoculars with rainguard and opened tethered lens caps
Galilean binoculars
Galilean binoculars
Porro prism binoculars, with distinctive eyepiece/objective axis offset
Porro prism binoculars, with distinctive eyepiece/objective axis offset
Binoculars diagram showing an Abbe–Koenig roof prism design
Binoculars diagram showing an Abbe–Koenig roof prism design
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A 200 mm diameter refracting telescope at the Poznań Observatory
A 200 mm diameter refracting telescope at the Poznań Observatory
Engraved illustration of a 46 m (150 ft) focal length Keplerian astronomical refracting telescope built by Johannes Hevelius.
Engraved illustration of a 46 m (150 ft) focal length Keplerian astronomical refracting telescope built by Johannes Hevelius.
Alvan Clark polishes the big Yerkes achromatic objective lens, over 1 meter across, in 1896.
Alvan Clark polishes the big Yerkes achromatic objective lens, over 1 meter across, in 1896.
This 12 inch refractor is mounted in a dome on a mount that matches the Earth's rotation
This 12 inch refractor is mounted in a dome on a mount that matches the Earth's rotation