Never wipe dust or dirt off your valuable binoculars using your handkerchief or shirt sleeve. More recently binoculars have been used for astronomical viewing.
The first thing to know about a compact binocular is that it is two small telescopes mechanically linked together. There are different generations of night-vision binoculars. A lot of binoculars are ruined when dropped accidentally.
When you are attempting a close up view of an object in the far distance, a very slight movement on your end translates into a big change in the area being viewed at the other end. As with the aperture of a camera lens, the size of objective lens determines the amount of light that can enter your binoculars. Each coating is designed to provide the maximum transmission of light through the lens, and minimum reflection and diffraction, resulting in a brighter, clearer picture than with standard non-coated lens models.
The first number gives the power of the magnification and the second number tells the diameter of the objective lens in millimeters which measures its light gathering strength. Capturing as much of that as possible is good as it means all the available light is getting to where you want it. Others have comfortable straps so you can wear them around your neck.
There are also models with compasses built in, to keep you always on track when camping. Binoculars are a key piece of equipment outdoors.
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