Prisms are made of a glass and depending on the type of glass the image produced by binocular can be either sharp clear and bright or vice versa.
Roof prism vs bak 4.
However just like roof prisms not all porro prisms are created equal and prisms made form bak 4 glass are usually better than those made from bk7 glass.
Roofs use expensive coatings design to match the best porros optical advantage.
Plus they come with turn and slide.
In the comparisons below i am making the assumption that the quality of glass used to make the prism are of equal quality.
Porros are far easier to build and have an advantage over roofs in optical clarity.
They are easy to grip with their durable rubber armored coating.
Bk7 vs bak4 and porro prism vs roof prism.
So if you re on a tight budget go ahead and look for a porro set sporting bak 4 prisms.
You gave them an image quality of 7.
And they re much better for overall general use.
Roof prism vs porro prism binoculars.
They are fully multi coated phase coated bak 4 prisms.
Roof prism bino sets are often much more expensive than porro designs of the same magnification.
Because the objective lenses are often spaced wider than roof prisms they can also sometimes produce a slightly better stereoscopic image.
It s just significantly different from bak 4 quality.
They ll provide just as vibrant an image as a corresponding roof set at a fraction of the cost.
But in the optics world that preference will certainly help you in the buying process.
Actually porro prism in bak 4 are a superior design to roof prisms at the same price point.
For 140 i think they are great.
Bak 4 quality is a lot better.
If you re a guy or gal who has a type you might be perceived as being shallow.
Bak 4 prisms are considered the best type of porro prism as they are made of superior optical glass to produce clearer images.
Bk 7 prisms are also used usually in lower priced binoculars.
Refraction and partial reflection.
These are satisfactory but inferior to the bak 4 prisms.
However now my wife wants her own binoculars.