A pair of binoculars can be seen as two such telescopes, side by side, which together produce an image which has the depth of field that we are used to, rather than just a large flat image. Compact binoculars are some of the handiest and most widespread of all optical instruments.
When you look at objects in the night sky, they are constantly revolving in its path, this makes objects move in the night sky. So having a small and handy binocular that you can always carry with you is ideal. If you are planning on taking your binoculars on the family boat you will want a pair that is completely waterproof.
A good rule of thumb is, unless you are a private investigator or international spy, avoid buying a pair of binoculars with a magnification/zoom greater then 10x's. You will need a magnification factor of at least 7, maybe up to 10 if you have a steady hand. Earliest documented history shows Hans Lippershey as the first telescope maker including both monocular and binocular variety even though he is not the first person to actually design and produce such a device.
The first number gives the power of the magnification and the second number tells the diameter of the objective lens in millimeters which measures its light gathering strength. When buying a telescope, look at your aspirations for owning a telescope, and what you want to get out of the telescope. If you have powerful lenses, the magnification is good, but the amount of captured light decreases significantly.
When it comes to binoculars you always get what you paid for. It's really easier to choose when you know more about them.
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