Binoculars or telescope? Your first instrument
Why binoculars are the best first instrument, what the numbers mean and what you can see with them.
Most astronomers will tell you the same thing: start with binoculars. They are cheap, quick to use, show a wide view and you probably own a pair already.
Reading the numbers
10×50 means 10 times magnification and 50 mm front lenses. Bigger lenses gather more light; more magnification shows more detail but shakes more. 7×50 or 10×50 is the classic astronomy choice; 8×42 is fine too. Above 12× you will want a tripod.
What binoculars show
- Craters and mountains on the Moon, best near the quarters.
- Jupiter’s four large moons changing position night by night.
- The Pleiades, the Double Cluster in Perseus and the Beehive cluster in Cancer.
- The Andromeda Galaxy as a soft oval glow.
- The Milky Way breaking up into countless stars.
When a telescope makes sense
Once you know your way around, a small telescope shows Saturn’s rings, Jupiter’s cloud belts and the phases of Venus. A 130–150 mm Dobsonian is simple and good value. Avoid cheap telescopes sold by magnification (“600×!”) with shaky mounts.
Never point any optics at the Sun without a certified solar filter over the front.