First thing to consider when looking at Binoculars is how we are going to use them. The optics field is quite large and the number of products is considerable.
Many pairs of binocualrs are not suitable for low-light conditions. The best binoculars for astronomy use are 7 x 50 or larger. If you are a backpacker or will be doing your birding on a bicycle, then you may wish to consider mid size or even compact binoculars.
In addition to this, the surface of the prism has a special mirror coating to prevent light loss. Generally, if the objective lens is 50 mm then it is considered to be a large binocular; if it is 42 mm, it is full size; if it is 32 mm, it is a mid size. 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.
You can find binoculars in prices ranging from ten dollars to one thousand dollars. If you are only going to spend a couple of hundred dollars for binoculars don't even bother to look at the higher priced pairs. Night vision binoculars are very comfortable to use because we are accustomed to seeing with both eyes, but they are pricey.
If you want powerful night vision optics for a cheaper price, consider night vision monocular. Bird watching has been around for many centuries and will probably be around many more.
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