Lens and Prism Coatings: Helpful Tips on Binocular Coatings
If you have a binocular then you must have heard about coatings. Binoculars have lens and prism coatings added to them.
The reason this is done is to improve the performance of any binocular. Today, almost every type of binocular has some type of anti-reflective coatings applied to them. Anti-reflective coatings are applied on all or some air-to-glass surfaces in the optic gadget to do the following:
- Boost light transmission
- Tyr and compensate for the color aberrations
- Enhance the resolution of the image
- To improve the color and contrast of the image.
One thing that you should know is this. Depending on the manufacturer or type of binocular construction, you will find that the coatings often vary enormously. Even so, here is how binocular quality is set in view with coatings.
- Coated: These are the low-level binos. Some of their surfaces are usually coated but not all the air-to-glass surfaces.
- Fully-coated: These models have all their air-to-glass surfaces coated.
- Multi-coated: Here, a number of air-to-glass surfaces have several layers of coat applied to them.
- Fully-multi-coated: This is the highest quality. It is a binocular model that has all its air-to-glass surfaces applied with several layers of coating.
Today, using the binoculars that have fully-multi-coated surfaces is the best. However, coating all these surfaces cost more money. Therefore, you should be ready to dig a little deeper in your pocket too. To learn more about lens coatings visit topbinocular.com.
What Do Anti-Reflective Coatings Do?
The anti-reflective coatings that are applied to the lenses and the prism surfaces of a binocular are very vital. They will reduce the light loss when the image goes through every optical surface of your binocular.
Consequently, they will improve the light transmission and also reduce the volume of the stray light that is reflected inside your optical device. This leads to improved image contrast and brightness.
Remember, the best coatings are quite costly to produce and apply. They will, therefore, add significantly to the total cost of the binocular.
What Do Phase Correction Prism Coatings Do?
The phase correction prism coatings will help to address the “phase-shift” effect that’s common to the roof prism binoculars. In the roof prisms, the path of the white light is usually split into two when it goes through the rood prism.
After that, it is recombined. However, on recombination, the two paths of light are always out “phase”. This happens only in rood prisms and reduces the contrast and resolution of the final image.
Because of this, top binoculars that use roof prism have special coatings applied to the surface of their prism. The coatings address the “phase shift” and in turn restore the quality of the final image.
What Are Mirror Coatings?
These ones also apply only to roof prism binoculars. They are applied to boost the level of light transmission through the used prisms. The cheapest mirror coatings are made of Aluminum and will result in light transmission of up to 87-93%.
The next is the silver mirror coating that will boost light transmission to a tune of 95-98%. Finally, the best mirror coating that’s found on high-end prisms is the dielectric mirror coating. It is a unique coating technology that achieves over 99% light transmission.
Binocular lens and prism coatings are very important. They will determine the quality of the resultant image. To get the best results though, you will have to spend a little more. The best binoculars are often proportional to the prices.