Guidelines for Field of View
 The field of view is the area seen through your binoculars. It is properly measured in degrees. The larger the field of view the more area you can see. Field of view is particularly important when observing moving subjects, like animals or birds, or at sporting events. If a binocular has a field of view of 372 feet at 1000 yards, you will see 372 feet of the fence. If the field of view is 250 feet at 1000 yards, you will 250 feet of fence. The field of view when expressed in feet the field is called linear, and when expressed in degrees it is called angular. Rather its an easy conversion; divide the liner field by 52.35 and you get the angular field.
Avid binocular users pay attention to this critical performance factor, because field-of-view is the actual width of the sight picture provided by your binoculars at a specific distance. Field-of-view is determined by magnification and the focal lengths of the objective and eyepiece lenses. But one thing is always true: More magnification means fewer field-of-views.
For observing at a close range in a dense jungle, or scanning the sky for raptors or large flocks of migratory birds or for picking up fast moving objects, a wide field of view is desirable. Wide-field binoculars generally tend to be heavier and bulkier than binoculars with standard fields, as such binoculars consists larger prisms and eyepieces. Rather on many models there is a noticeable loss in sharpness at the edge of the field. Wide field binoculars are generally the most popular for nature observation but you should consider all these factors in your evaluation of this feature.
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Information Center |
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Binoculars Technical Guide |
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