The Large Binocular Telescope uses two curved mirrors to gather light
Apollo 12 Lunar Module Intrepid prepares to descend towards the surface of the Moon. NASA photo by Richard F. Gordon Jr.
Schematic of a Keplerian refracting telescope. The arrow at (4) is a (notional) representation of the original image; the arrow at (5) is the inverted image at the focal plane; the arrow at (6) is the virtual image that forms in the viewer's visual sphere. The red rays produce the midpoint of the arrow; two other sets of rays (each black) produce its head and tail.
Galileo's sketches of the Moon from the groundbreaking Sidereus Nuncius
Eight-inch refracting telescope at Chabot Space and Science Center
A study of the Moon from Robert Hooke's Micrographia, 1665
The Keck II telescope gathers light by using 36 segmented hexagonal mirrors to create a 10 m (33 ft) aperture primary mirror
The earliest surviving daguerrotype of the Moon by John W. Draper (1840)
These eyes represent a scaled figure of the human eye where 15 px = 1 mm, they have a pupil diameter of 7 mm. Figure A has an exit pupil diameter of 14 mm, which for astronomy purposes results in a 75% loss of light. Figure B has an exit pupil of 6.4 mm, which allows the full 100% of observable light to be perceived by the observer.
Photo of the Moon made by Lewis Rutherfurd in 1865
Two of the four Unit Telescopes that make up the ESO's VLT, on a remote mountaintop, 2600 metres above sea level in the Chilean Atacama Desert.
The first picture of another world from space and of the Moon's far side, photographed by Luna 3 in 1959.
Comparison of nominal sizes of primary mirrors of some notable optical telescopes
Museum replica of Luna 1 and Luna 2
Harlan J. Smith Telescope reflecting telescope at McDonald Observatory, Texas
Scale model of Luna 3
First image of the Moon taken by a U.S. spacecraft, Ranger 7 in July 1964
Block III Ranger probe
First photo ever taken from the surface of the Moon, by Luna 9 in February 1966.
Luna 9 was the first spacecraft to achieve a landing on the Moon in Feb 1966.
Earthrise taken by William Anders of Apollo 8 in Dec 1968
1966 stamp with a drawing of the first soft landed probe Luna 9, next to the first view of the lunar surface photographed by the probe.
Apollo 17 astronaut Harrison Schmitt standing next to a boulder at Taurus-Littrow during the third EVA (extravehicular activity).
Luna 16 first lunar sample return for the USSR in Sep 1970.
Cassini–Huygens took this image during its lunar flyby, before it traveled to Saturn
Animation of Lunar Reconnaissance Orbiter trajectory from 23 June 2009 to 30 June 2009
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Telescope that gathers and focuses light mainly from the visible part of the electromagnetic spectrum, to create a magnified image for direct visual inspection, to make a photograph, or to collect data through electronic image sensors.

- Optical telescope

The invention of the optical telescope brought about the first leap in the quality of lunar observations.

- Exploration of the Moon
The Large Binocular Telescope uses two curved mirrors to gather light

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