The first binoculars, made shortly after the first telescope, were heavy and long, and produced a flat image. The invention of Porro prism binoculars changed the efficiency and popularity of these magnification devices.
History
According to Binoculars Information, Porro prism binoculars were developed by Italian inventor Ignazio Porro in the mid-1850's, several decades before roof prism binoculars.
Porro Prism Definition
The Binocular Site explains that Porro prisms are triangular prisms placed inside binoculars in very specific positions. The prisms bend the path of incoming light, allowing the light to travel much farther without making the binoculars longer and heavier.
Construction
Porro prism binoculars are basically two telescopes positioned side-by-side. The objective lenses--those farthest from your eyes--are set much wider apart than the eyepiece lenses.
Features
Porro prism binoculars offer high magnification power, sharp contrast and 3-dimensional viewing.
Popularity
Traditional style Porro prism binoculars have waned in popularity in recent years in favor of more streamlined and lightweight, yet less efficient roof prism models.
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