Binoculars Basics

Almost as soon as the telescope was invented in the seventeenth century, the idea of putting two magnifying devices side by side to create binoculars also sprang into being. However, early binoculars had a very narrow field of vision, and couldn't magnify very far. A similar design still survives, however, using a convex objective lens and a concave eye lens. You'll see these lenses used in cheap or toy binoculars, and in opera glasses. While they're good for viewing objects that are only a little too far away, these simple binoculars don't do the job when it comes to tiny, distant objects.

In the mid-nineteenth century, a major innovation in binocular technology came about. The use of a prism allowed for shorter binoculars and a better sense of depth. When makers further refined the prism idea, creating roof prism binoculars, a narrower, easier to transport device was created. However, binoculars with this type of prism had a slightly lower brightness than the earlier prism types, because silvered surfaces were used to reflect the image. You can still get both kinds of prisms in modern binoculars, with roof prism types being a little more expensive, because they require tighter tolerances.

Now, of course, we have binoculars that offer extremely high magnification options, wide fields of view, and special coatings to help reduce reflection from dust specks and other things that might cause problems with the view. Image stabilization helps reduce shaking from our hands, and can either be done using an internal gyroscope, or a battery operated sensor. Binoculars can be used for sightseeing, birdwatching, military purposes, and watching the stars. There are lots of manufacturers and many more models available.

You can get binoculars in all sorts of types and sizes. There are small, compact mini-binoculars, for those who would like to be able to carry their viewing devices in their pockets. More powerful models are larger and costlier, and some military view finders can weigh as much as ten tons! No matter what you'd like to see, or your budget, there's a pair of binoculars that'll work for you. Just be sure that you know what you want to buy before you make a purchase. There are so many different features that it's easy to get confused. Fortunately, a quick look online will turn up plenty of helpful binoculars buying guides. Check out your options next time your in a science or sporting goods store. You might be surprised at the options available to you.

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