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Fact #1. One primary reason to choose one of these over a pair of binoculars is weight. A pair of binoculars will usually weigh twice as much as a monocular with equivalent magnification power. When packing for an extended camping trip, each gram matters. It is also easier to fit in your pocket and quickly pull out when necessary. Hikers like them for watching wildlife and looking at distance rock formations.
Fact #2. They offer more situational awareness. With these, you only use one eye to view the long range object or area in question. The other eye is free to survey your close surroundings. This can be of critical importance if you are hunting or in emergency situations.
Fact #3. The first thing to note when considering which one to buy is magnification power. Please note that stronger magnification is not always better. The more powerful it is, the harder it will be to keep it steady and in focus. The most common and popular magnification for most purposes is 8x. At this level, it is reasonably easy to hold steady without a tripod or monopod. The field of view is also relatively wide. It makes it easier to locate and follow distant objects.
Fact #4. Some have night vision capabilities. These can be a great purchase for nature scientists. They are also widely used in the military and law enforcement. However, most ones that work well at night have optics that are objectively inferior in daytime.
Fact #5. The earliest functional telescopes were designed by Dutch spectacle makers in the first years of the 17th Century. In 1609, Italian astronomer Galileo Galilei designed an improved version of those first refracting telescopes. He was the first person to behold a celestial object beyond the vision of the naked eye.
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