The quality of a pair of binoculars rests on their crystal clear visibility. There are many advantages of using binoculars over monoculars.
To correct this, two prisms are placed inside the binoculars, between the objective and the eyepiece. I originally purchased the Monarch 10x50's for bird-watching and long range mountain scanning in Arizona, however, I found the extra sharpness of the 8X resolution meant that I didn't need the larger 10X magnification, because they had such excellent detail. All light transmitting surfaces are covered with multi-coating to increase brightness.
I had been hinting for months to my fiance, and so I was thrilled when I received a pair of Nikon Monarch Binoculars as a birthday gift. A good rule of thumb is, unless you are a private investigator or international spy, avoid buying a pair of binoculars with a magnification/zoom greater then 10x's. In order to define the quality performance of their products, binocular makers present the field of view in mathematical conversions that show a variance of fields.
Monoculars meant as a toy for children have magnifications of only three or four times and they are very cheap. Roof prism binoculars are so much easier to water and fog proof because of internal focusing. If the seals develop a leak, the nitrogen could leak out and allow moisture into the chamber.
As with almost everything else in life, with binoculars you get what you pay for. The ones in the two to five hundred dollar price range are generally sufficient for bird watchers.
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