When buying binoculars you will first want to figure out how and where you
will be using them. Not all binoculars are good for all purposes. There are
certain binoculars that are good for looking at the stars and others that are
good for watching birds. Of course there are multi use versions available.
How to Figure out The Numbers
The numbers on the side signify the power of magnification and the diameter of
the lenses. For instance lets say the number appearing is 8x 40, you then know
that it can magnify 8 times and it has a 40 mm lens diameter. The image quality
is inversely proportional to the magnifying ability and would affect viewing as
it gets more difficult to hold the binoculars in one position. If you are using
them for bird watching then you would probably prefer 8 to 10 fold magnification
because of its convenience and ease of use. A pair with a 4 fold magnification
is the type that you would use for outdoor sporting events or concerts.
Lens Diameter
The lens diameter is important because the larger diameters would seize more
light which improves the image quality and broadens your viewing area. Expressed
in angular dimensions the field of view is also shown as the feet-span of the
view from one side to another as appears at 1000 yards. As the field of view
gets smaller, it becomes increasingly difficult to find what you are looking at.
Price and Quality Are Important
Price and quality will largely depend on the types of coatings on the lenses and
prisms. While coatings may have different areas of function, their primary job
is to arrest any loss of light due to reflection. The sophistication of the
coatings used will make quality and price vary wildly from type to type and
brand to brand.
Besides those important features you will want to look at the toughness of the
binoculars. If you are only going to use them occasionally then that may not be
an important factor, but if you plan on taking them out to concerts all the time
or on whale watching boat trips then toughness and waterproof features are going
to be important.
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