About Binoculars
About binoculars
Do you remember the first time you peeped into a pair of binoculars? Amazing, wasn't it? Probably, the first question about binoculars at the back of your mind was how it's able to make objects appear closer or bigger than they are.
Binoculars are not one and the same. Each model represents different types of applications and technology. But the basic features about binoculars are:
Magnification power refers to how many times a pair of binoculars is able to magnify or enlarge an object on a distance from a viewer's eye point. If you have a 10x32 binocular, it means this binocular is able to magnify an object 10 times the life size. However, for regular binoculars, high magnification power does not equal to high performance since these types of binoculars magnify minor jitters as well. Ideally, magnification power from 7 to 9 is quite enough for many applications. The number 32 is the diameter of the front lenses in millimeters.
The width of the eyepiece or ocular lens assists viewing through the binoculars while the shape and design of the ocular lens influences the width of field of view.
Binoculars may essentially be divided into two types, porro prisms and roof prisms, which differ in internal prism, alignment of objective lens, and ocular lens. Porro prisms make up between the objective lens and eyepiece; these are easier to manufacture because of the simpler technology it applies. Roof Prisms, meanwhile, are aligned in a straight line with the lenses. Binoculars with roof prisms are typically lighter and more compact, but much expensive than the former type.
The exit pupil refers to the light's entry and determines how bright an image will appear from the viewer. Much similar to an eye's pupil, the wider it dilates the more light comes in. It is typically calculated by dividing the diameter of objective lens by the magnification power. A 2 to 3mm exit pupil is enough for daytime viewing, and around 6 to 7mm for low light conditions.
More about binoculars, the eye relief means the distance from the ocular lens where one can see an image at its sharpest. For comfortable viewing, an eye relief between 10 to 15mm would suffice.
Field of view refers to the whole area as seen through a pair of binoculars typically measured in feet at 1000 yards. Normally, higher magnification power narrows the field of view.
About Binoculars – the stabilized types
This technology uses a shockproof technology. For people with shaky hands or those who are watching moving objects while standing/sitting on a mobile platform, stabilized binoculars are able to calculate the amount of vibrations in an internal microcomputer using either two mechanisms: vari-angle and tilt. This technology makes images appear steady despite any movements. For the highly budgeted binocular buff, this is a good choice for the outdoors, day and night.
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