High power binoculars are just one of the many types of binoculars. A binocular is like using two small telescopes and each eye will have its own eye piece, prime focal point, objective lenses and exit pupil. With the correct orientation you can see many objects that are far away just like they were up close.
When choosing a pair of binoculars you want high quality binoculars as these will have excellent optical and mechanical parts. All quality binoculars will be more expensive but the extra money is worth it and a pair of high powered quality binoculars can last you a long time.
High powered binoculars are referring to the magnification power. The more magnification the more detail you can see and the farther away you can see. With very high powered binoculars you may be able to see details of the nearby planets or the moon. There are also binoculars that have variable magnification though the range of magnification is not always the best.
High powered binoculars are really very good for astronomy and can even replace a telescope. However with such high magnification comes instability as the smallest movement will also be greatly magnified. To avoid this it is recommended that you use a tripod or other form of image stability.
Along with have stability issues the higher the magnification the more light you will need and to compensate for these high powered binoculars will have very large objective lenses, so that they can gather more light. This can make the high powered binoculars very large and heavy so think of were you will be using them as they are bulky.
There are a few disadvantages to using high powered binoculars but if you are interested in viewing objects that are very far away, like the stars, then you will need high powered binoculars.
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