One highlight is they include bak 4 porro prisms which gives them a unique design and shape.
Roof prism vs bak 4.
But in the optics world that preference will certainly help you in the buying process.
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.
Refraction and partial reflection.
Bak 4 quality is a lot better.
Because the objective lenses are often spaced wider than roof prisms they can also sometimes produce a slightly better stereoscopic image.
Bak 4 prisms are considered the best type of porro prism as they are made of superior optical glass to produce clearer images.
You gave them an image quality of 7.
Roof prism vs porro prism binoculars.
However now my wife wants her own binoculars.
This doesn t mean binoculars made of bk 7 prisms are not usable or produce a bad image.
And they re much better for overall general use.
For 140 i think they are great.
Binoculars with bk 7 prisms can be judged by a squared off side to the general roundness of the image.
Roofs use expensive coatings design to match the best porros optical advantage.
They are easy to grip with their durable rubber armored coating.
In the comparisons below i am making the assumption that the quality of glass used to make the prism are of equal quality.
It s just significantly different from bak 4 quality.
Porros are far easier to build and have an advantage over roofs in optical clarity.
Bk7 vs bak4 and porro prism vs roof prism.
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.
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.
Plus they come with turn and slide.
Bk 7 prisms are also used usually in lower priced binoculars.
Actually porro prism in bak 4 are a superior design to roof prisms at the same price point.
So if you re on a tight budget go ahead and look for a porro set sporting bak 4 prisms.