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Line 9: − A binocular usually has three settings. One of them is used to change focus the binoculars on objects of different distances. The other two are personal settings which vary from person to person but which, for any person, only need to be set once and do not need to be changed subsequently. + Line 15:
Line 15: − +
→Settings: plural
==Settings==
==Settings==
Binoculars usually have three settings. One of them is used to change focus the binoculars on objects of different distances. The other two are personal settings which vary from person to person but which, for any person, only need to be set once and do not need to be changed subsequently.
1) A focusing knob is usually provided in the center which focuses both sides at the same time, to focus the binoculars on objects of varying distances.
1) A focusing knob is usually provided in the center which focuses both sides at the same time, to focus the binoculars on objects of varying distances.
2) The distance between the eyes (the ''intraocular distance'') varies from person to person. In order to allow the distance between the binocular tubes to be changed, they are hinged together at the center. Often there is a graduated scale at the hinge from which the intraocular distance can be read, usually in millimeters. If a user remembers their intraocular distance, they can quickly bring any pair of binoculars back to setting that is proper for them.
2) The distance between the eyes (the ''intraocular distance'') varies from person to person. In order to allow the distance between the binocular tubes to be changed, they are hinged together at the center. Often there is a graduated scale at the hinge from which the intraocular distance can be read, usually in millimeters. If a user remembers their intraocular distance, they can quickly bring any pair of binoculars back to setting that is proper for them.
3) A second focusing adjustment is provided, usually on the right eyepiece, usually with a scale and markings in diopters. For many people, this adjustment should be set to the zero mark. Some people will find that because of refractive differences in their eyes, when the left binocular is perfectly focussed, 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.
3) A second focusing adjustment is provided, usually on the right eyepiece, usually with a scale and markings in diopters. For many people, this adjustment should be set to the zero mark. Some people will find that because of refractive differences in their eyes, when the left binocular is perfectly focussed, 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.
==Designs==
==Designs==