Bk 7 prisms are also used usually in lower priced binoculars.
Roof prism vs bak 4.
Bak 4 prisms are considered the best type of porro prism as they are made of superior optical glass to produce clearer images.
Binoculars with bk 7 prisms can be judged by a squared off side to the general roundness of the image.
One highlight is they include bak 4 porro prisms which gives them a unique design and shape.
These are satisfactory but inferior to the bak 4 prisms.
Refraction and partial reflection.
And they re much better for overall general use.
In the comparisons below i am making the assumption that the quality of glass used to make the prism are of equal quality.
Bk7 vs bak4 and porro prism vs roof prism.
However now my wife wants her own binoculars.
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.
Because the objective lenses are often spaced wider than roof prisms they can also sometimes produce a slightly better stereoscopic image.
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.
Actually porro prism in bak 4 are a superior design to roof prisms at the same price point.
Porros are far easier to build and have an advantage over roofs in optical clarity.
For 140 i think they are great.
Roof prism bino sets are often much more expensive than porro designs of the same magnification.
If you re a guy or gal who has a type you might be perceived as being shallow.
They are fully multi coated phase coated bak 4 prisms.
Bak 4 quality is a lot better.
They ll provide just as vibrant an image as a corresponding roof set at a fraction of the cost.
You gave them an image quality of 7.
They are easy to grip with their durable rubber armored coating.
It s just significantly different from bak 4 quality.
Roof prism vs porro prism binoculars.
So if you re on a tight budget go ahead and look for a porro set sporting bak 4 prisms.