The prims are in the shape of a right angled triangle and they reflect the light rays through the binoculars so you see your image clearly.
Roof prism porro prism.
Of both types there are good and not so good instruments.
Roof prisms are the newer option.
Heavier design zig zag shape not so easy to grip.
Porro prism vs roof prism binoculars which is better.
Porro prism binoculars have eyepieces that are closer to each other while objective lenses have larger distance.
They ll provide just as vibrant an image as a corresponding roof set at a fraction of the cost.
Roof prism bino sets are often much more expensive than porro designs of the same magnification.
Roof prism binoculars have lately become more popular than porro prism binoculars.
More expensive due to higher manufacturing costs.
Porro prism binoculars were standard until the 1960 s when the zeiss and leitz companies introduced roof prism binoculars whose objective lenses were straight in line with the eyepieces.
Roof prism binoculars were compact light and comfortable to hold.
Compact lightweight and comfortable to hold.
The difference between porro prism and roof prism binoculars is in the design and the respective features.
However porro prism binoculars are great watching birds or other small objects.
Roof prism binoculars construction is different and have two aligned barrels with eyepieces and objective lenses that are closer to each other than in porro prism binoculars.
So if you re on a tight budget go ahead and look for a porro set sporting bak 4 prisms.
Increase in popularity after the introduction by zeuss and leitz.