It is highly reflective with a refractive rate of about 1.52. BK7 is made out of borosilicate (crown) glass.Let’s take a quick look to find out what each of them is! But do you know what they are exactly? Keep reading to understand this binocular measurement!īK7, BaK4, and SK-15 are three basic types of prisms that most people would choose. I know many of you have heard of the names BK7, BaK-4, and SK-15. If you are wondering about the most significant difference between these two types, the roof prism is a lot more streamlined and more attractive than the other. They all have the same function, which is to allow binoculars to be more compact and narrower than its Porro prism models. Roof prism designs have a couple of variations such as Amici, Schmidt-Pechan, and Abbe-Koenig. Unlike Porro Prism, roof prisms are named for the shape of the assembly.
However, the eyepieces are further apart, and the lenses are closer together. Reverse Porro Prism: this system also has offset eyepieces to lens.The most noticeable thing of this type of prism is that the eyepieces are a lot closer together while the lenses are further apart. Standard Porro Prism: the standard Porro Prism has offset eyepieces to objective lenses.
In general, Porro Prism is easier to manufacture and cost a lot less. It has a much more iconic and traditional design compared to other types of prims. Porro Prism is named after the Italian inventor called Ignazio Porro.
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