Example image of eyePlorer eyePlorer map for 'Achromatic lens': Chromatic aberration Lens (optics) Spherical aberration Dispersion (optics) Doublet (lens) Glass Crown glass (optics) Flint glass Optical power Focus (optics) Wavelength Isaac Newton Barrister Chester Moore Hall George Bass (optician) John Dollond Apochromat Peter Dollond Achromatic telescope 1729 in science George K. Kunowsky Great refractor Non-achromatic objective Georg Simon Plössl Tessar 1733 in science Carl Kellner (optician) Johann Hieronymus Schröter Galileoscope Heliometer Peter Barlow (mathematician) Small telescope Timeline of telescopes, observatories, and observing technology History of the telescope Jesse Ramsden Gotha Observatory Sky-Watcher Telescope Lead glass Optical telescope Abbe number James Lick telescope English inventions and discoveries Borescope Condenser (microscope) Optical microscope Refracting telescope Achromatic Rodenstock GmbH Newtonian telescope