There are many options from very sophisticated binoculars for surveillance or night navigation to simple binoculars for kids to have fun with. Astronomy stores are accustomed to dealing with the confused beginner though of course not everybody has the opportunity to visit a specialist store.
First, determine just how and under what circumstances you will be using your new binoculars. The same problem is faced while using telescopes hence many people prefer binoculars instead of monoculars or telescopes. All other things being equal, the larger the objective diameter, the brighter the image you see through the binoculars.
Glass also has a tendency to reflect as much as five percent of the light that arrives at its surface back towards the light source. If you will be staying in one spot for a period of time then it might be to your advantage to consider mounting the binoculars on a tripod which would free up both hands and not require you to find the viewing area, refocus, and keep steady each time you pick them up. Quality night binoculars have an infrared illuminator which increases the available infrared light.
In the event of an accident, you will be glad that you chose rugged and waterproof binoculars. Higher quality glass also yields brighter images and sharpness. Magnification is not the best way of choosing a telescope, as a clear image is more important then simply magnification.
So, get a good pair of binoculars and enjoy the birding. But if you're into astronomy, you'll need a high powered pair.
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