Similar to 双眼鏡

4

5

6

7

8

9

13 (number)

19 (number)

40 (number)

50 (number)

70 (number)

Wolter telescope

Galilean telescope

Quito Astronomical Observatory

Aerial telescope

Refracting telescope

Gregorian telescope

Altazimuth mount

Optical telescope

Schiefspiegler

Schwarzschild telescope

Schmidt–Cassegrain telescope

Schmidt camera