However, getting the sharpest focus may take you a lot of time. The focus knob lies between the barrels to help produce more explicit images. To make it easier to follow, let’s first dig deeper into the focus knob. Fully multi-coated (FMC) Optics: multiple anti-reflective coatings on all air-to-glass surfacesįocusing is another important thing you should spend time understanding when choosing binoculars.Multi-Coated (MC) Optics: a single anti-reflective coating on all air-to-glass lens surface.Fully Coated (FC) Optics: multiple anti-reflective layers on at least one lens surface.Coated (C) Optics: one single anti-reflective coating on at least one lens surface.The next question is, how do we classify binocular coatings? There are some basic types as follows: In most cases, the way light reaching your eyes depends a lot on how it goes through coatings. If the coatings are unable to match the prisms, you would not be able to use the binoculars.įor starters, coatings are a kind of formula that allows higher transmission of light-waves into your eyes. Glass CoatingsĪpart from all the glass elements, prism type and type of glass, glass coatings are also an essential factor that can make the difference. That idea has encouraged many manufacturers to use magnesium as it is a lot lighter yet still firm. The lighter optic will make it a lot less tired for users to keep in such a long time. Let’s just imagine that you have to hold the binoculars on your eyes for a long time. The reason why magnesium is used in creating chassis is that it has the strength-to-weight ability. Being naturally corrosion resistant is also a considerable advantage. It is known for being durable, light, and easy to bend. AluminumĪluminum is always one of the most popular materials on the market. It can hardly be expanded or contract easily when the temperature changes suddenly. One of the most significant advantages of using Polycarbonate is that it can resist temperature changes. In most cases, the chassis is made out of: Polycarbonate plastic Chassis Materialįor those who do not know, the chassis is the frame of the binocular around the whole optic. Just as the title suggests, the lens is well known for its fantastic transmission properties. This is another version of ED glass, which is classified as a unique and high-quality sub-category. Instead, it implies the result of the ED lens, which is of high resolution. The term HD, surprisingly, is not a type of glass. ED glass also has a low level of refraction, which means it needs curved elements for the same focal length.The focal length may change a little bit. ED glass is not so stable when there is a change in temperature.Some interesting thing about the ED glass: Most expensive optics will have an ED glass lens as it allows users to take pictures that are clear, sharp with no color fringing. In short, the image produced will be a lot brighter and cleaner. This type of lens is known to prevent or at least lessen the chromatic aberration as it provides more options to focus and direct the light. SK-15 is an in-between of the two types mentioned.ĮD, HD, FL, HT, what do they exactly mean? Let’s find out! ED: Extra-low dispersion.It has a far higher refractive index, which makes the images brighter and well-edged. ![]() BK7 can be used for both Porro prism and roof prism. 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.
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