Interpupillary distance (IPD) is the distance between the pupils of your eyes measured from center to center when your eyes are focused on infinity. IPD
There are literally thousands of different formulations of glass in the world. Each formulation has its own very specific optical properties and consequently its own
Twilight Factor is a number used to compare the effectiveness of binoculars or spotting scopes used in low light. The larger the twilight factor, the more
Compactness and ruggedness are two major features to consider when looking for a pair of binoculars. Compactness relates to whether roof, porro, or other prisms
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