Binoculars
Binoculars
A great optical instrument used to view distant objects with both eyes is a quality pair of binoculars. They can bring wildlife, sporting events, or vessels at sea up close. They can also be utilized in basic astronomy instead of a telescope. Twin barrels containing a system of lenses, one for each eye is how binoculars are structured. The distance between the eyes varies from person to person, so there must be way for adjusting the distance between the binocular eyepieces. Therefore, the barrels are hinged together making adjustment for your comfort very easy.
Binoculars usually have three settings. One setting is used to change the focus on objects of different distances. The others are personal settings which vary from person to person.
If used just by one, you can set once and do not need to change. These are the following settings:
A focusing knob is usually provided in the center which focuses both sides at the same time, allowing to focus the binoculars on objects at various distances.
They are hinged together at the center. Often there is a graduated scale at the hinge from which the distance, usually in millimeters can be read. If a user remembers the distance, they can quickly bring any pair of binoculars back to setting that is proper for them.
On the right eyepiece, a second focusing adjustment is provided, usually with a scale and markings in diopters. When the left binocular is perfectly focused, the right binocular will be slightly out of focus. It can be brought into focus by adjusting the right eyepiece focus. Once the right eyepiece focus is set correctly, it will be correct at all distances and does not need to be adjusted again.
For many people, this adjustment should be set to the zero mark.
Most modern binoculars are prismatic binoculars. The lens systems used in them are similar to the design of an “astronomical” refracting telescope, but a system of erecting prisms is added to turn the image right side up.
Warning!
Never point binoculars at the sun. If you look at the sun directly without any eye protection through binoculars you will possibly be blinded. On a sunny day take care that the binoculars point well away from the sun.