I'd suggest when choosing your binoculars research or ask what quality the glass prisms are inside them.
Here's a link for some basics on binoculars:
http://www.chuckhawks.com/binocular_basics.htm
Extracted from that site on prism glass:
Quote:
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Like roof prisms, not all Porro prisms are created equal. BAK-4 prisms are the best; they are made of superior optical glass that produces clearer images. These are what you want in your binoculars. BK-7 prisms are also used, usually in lower priced binoculars. These are satisfactory, but they are inferior to the BAK-4 prisms. Some manufacturers will not tell you what kind of prisms they use, usually because they are of inferior quality.
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You do pay more for the better quality BAK4 prisms but IMO it's worth it.
The kind of quality in the views is mind blowing.
My Bushnells I bought has these BAK4 prisms and they are stunning in both day and night, nature or astronomy.