Any stain or mark on the surface of a binocular lens tends to scatter light, thereby producing low-contrast viewing. The optics field is quite large and the number of products is considerable.
Compact binoculars are ergonomically designed and are the best choice in terms of value for the money. Various accounts exist about monoculars in ancient arabia and in many of other parts of the world. If you are going to be walking then full size binoculars are certainly worth your consideration.
In addition to this, the surface of the prism has a special mirror coating to prevent light loss. Compact binoculars are an ideal first pair for children, they are easy to use and lightweight which means the kids get more enjoyment out of their outdoor activities, and spend less time moaning about having to hold those heavy old things your dad gave you. But mass production and better technologies have brought down the price substantially, so that the common person can afford them.
In most cases, pocket binoculars are of prism roof design and the front lenses and the eyes come in a straight line; such binoculars are usually compact. Sometimes you can buy a great pair of binoculars on the Internet cheaper than in the stores.
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