optical coatings - why they\'re important and what things to avoid

by:ZHENHUA     2020-03-18
Take a look at any pair of binoculars, flickers, and most glasses, and you can also observe that they often have a glowing blue, green, and a slightly purple hue in their hearts.
This is a sign of the optical coating.
In the past few decades, the optical coating has greatly improved the optical standard.
The reason they exist is easy: every time light enters the glass from air, it loses up to 8% of the light due to scattering/reflection.
However, when you consider a basic refractive mirror telescope, it has a chromatic aberration mirror with air flow intervals (
Zoom lens for several elements)
A good double element eyepiece can have 4 Airto-
Cup transmission.
The telescope has the same problem, the only reason is that they have an inner prism that includes more air. to-
It\'s actually glass transmission. (
Glasses don\'t need too much coating, but they don\'t usually cost too much and usually don\'t hurt to include).
Optical coatings have therefore been developed.
Coatings often do not solve the problem of light scattering, but they will certainly reduce the problem of light scattering.
Good coating can reduce light scattering from 8% loss to 4-6%.
Even add more layers, or more
The coating enhances the reduction of scattering, as does the standard for coating applications.
But nothing can end the scattering.
The optical coating in the lens is almost always made up of magnesium Flouride (MgFL).
They are applied in a vacuum pressure chamber.
When you consider the surface area of the lens at a certain position, a single optical coating must have an extremely subtle blue color. Multi-
The coat may have green and purple color as soon as you check the top.
Overall, there are many accepted categories of optical coatings: coating, full coating, multi-coating
Coating, morecoated fully.
They are considered to be like this: the coating means a minimum of airto-
The glass surface area in the optical program has an optical coating.
Full coating means all the airto-
The glass area in the optical program has an optical covering. Multi-
Coating means a minimum of airto-
The glass surface area in the machine is equipped with many opticscoat.
The rest must have at least a separate optical coating. Fully Multi-
Coating means all the air. to-
There are multiple glass areas in the machinecoatings.
There are several changes to this.
Many optics in European countries
Coats are often called \"excessive \".
What is even more confusing is that some companies that continue to operate will definitely give their paint a title.
Sometimes, it is necessary because the coating is different from the standard coating, and more so, it is actually only marketed regularly.
The coating has a dark side, the most serious of which may be the misuse of the \"Ruby coating\" on the telescope \".
The Ruby coating was originally obtained from the Steiner telescope, which likes to produce special eye-to-eye coatings for specific environments, such as hunting telescopes, which better attract objects in leaves, desert coatings, used for exactly the same goals in the sand.
A coating produced by Steiner is ruby-colored.
It works acceptably, but it works by partially blocking the lighting of some wavelength.
The Steiner version did a bit, but there was a problem with the final coating: it looked cool.
Because the Ruby coating looks cool, Madison and Hollywood Boulevard are starting to use telescopes in advertising and movies with a ruby coating.
This is a negative thing in the end.
Start production of Ruby-
Coating telescope for container-load.
But there is a problem: The Ruby coating does not give you a good image.
If you look at a Ruby-covered eye, evaluate it with a normally coated eye so it looks a bit faded.
The Blues and the Greens are too prominent and the Reds usually fade.
Including considering a photo of a sun bleach.
This is because the red part of the spectrum is deflected by the Ruby coating, which is low
End-eye suppliers made of brighter, brighter red coatings reduce the increasing amount of red light.
In the end, it definitely reaches the level of truth that you don\'t need to be low
Price eyes with Ruby coating.
But Ruby soon lost its value.
Birdwatchers know that the drop in red means they may not see everything in their favorite birds, and people want to know why very few high-end telescopes do not use a Ruby coating if they are so good, some double eye sellers object directly to the Ruby coating.
Soon, most of the Ruby-coated binos started using the normal coating.
Still, it is possible to find the telescopes covered by Ruby, but despite the bad TV ads, they are usually sold for the cheapest price.
For those who don\'t have a better idea, they usually like these \"cool\" looks.
If you encounter a pair of ruby telescopes, please stay away from them.
In fact, their low finish price is not worth it.
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