So you may opt for a monocular with lower magnification power if you want a wide field of view.
Keep in mind that as the magnification power gets higher, your field of view goes down. The first number identifies the magnification or power. You may opt for higher magnification power if you are experienced with using binoculars, spotting scopes, and monoculars. Binoculars are described using two numbers, such as 7 x 50 or 8 x 25. This means that they have 7x magnification and the objective lenses are 50mm in diameter. If you want monoculars with higher magnification power, you may go for a monocular with a 9x or a 10x magnification. The classic size of binoculars for marine use is 7x50. If you are looking for an easy to use monocular with decent magnification, you may opt for a 5x, 6x or 8x one. Though higher magnification can seem like a better option, it will be harder to use the instrument at higher magnifications, as small movements make the image jump more at higher magnifications. Most monoculars have a magnification power of 5x to 8x. And it measures how much a single image has been enlarged by the device. The power of 12x50 in binoculars means that the objective lenses (the front lenses) are 50 mm in diameter and the eyepieces (the back lenses) are 12 times. This is a critical number, because it indicates. 10x42 are best for things like bird watching, hunting, concerts, sports events, etc, because they have high magnification, good light quality, and yet are still easy to hold steady. The number following the magnification power is called the objective lens size, also referred to as aperture. The most common configuration is that invented in 1849 by Carl Kellner. 
The lens furthest from the viewer's eye is called the field lens or objective lens and that closest to the eye the eye lens or ocular lens.
It’s also known as their objective lens size or exit pupil. Answer: 10x42 means the binoculars have 10x magnification power (compared to the naked eye) and 42mm objective lens diameter. Binocular eyepieces usually consist of three or more lens elements in two or more groups. Monoculars with higher magnification power will let you see further and in more detail. The power of your binoculars refers to the magnification level that they offer. The magnification power of the monocular will affect how far and how detailed you can see something. Decide how much magnification power you need.
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