Binocular Prisms are what let you see a correctly oriented image when you look through a pair of binoculars. There are really only two types of prisms in common use, Porro prisms and Roof prisms. Your choice comes down to how you plan to use them. Style and cost may be factors in your choice but usually your preference is not the type Roof or Porro but the way the binoculars handle as you use them. It really becomes just a personal feel for what you want.
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