Motion around this one axis then tracks stars. Harder to engineer, easier to operate. Most telescopes use equatorial mounts but largest ones are Alt-Az. See image at right and diagram. Other EM spectral bands.
Astronomers now exploit wide regions of the full electromagnetic spectrum.
Astronomical objects are so distant that there can be no 3-D effect. However, views with binoculars can be especially vivid because simultaneous use of both eyes produces less strain, and the optics of binoculars usually allow for easy centering of the eyes on the emergent beam. Here, the first number is the net magnification of the binoculars, and the second is the diameter of the primary lenses in millimeters. Good types for general astronomical observations are 7x35 or 8x50. 10 power and higher binoculars require tripods for stability. The field of view is also often marked on the binoculars, typically given as the diameter in feet for objects at a distance of 1000 yards.