What is the difference between a telescope s red and green coating? That s good, isn t it?

Let's start with the coating.

The function of lens coating is to reduce reflection, increase light transmittance, and improve the brightness of observation, the color of the coating needs to be determined according to the optical material and design, the lighter the coating, the smaller the reflection, the better.

Most of the optical components of the telescope are made of general optical materials, and now most of the blank materials are profiles, using high-speed cold processing technology, and the coating generally uses SIO2, CRO2, and MGF2 multilayer films, which is what we usually call red film. It is mostly used in civilian telescopes.

Green film is mostly used in military telescopes. This is due to the fact that military telescopes have very high requirements for spectral range (requiring coverage of various environmental factors such as day, evening, and night) and light transmittance, and generally use broadband multilayer film system, generally green film or purple film.

Through the application of the two, it is not difficult to see the difference between the green film and the red film.

It should be added that many red films belong to decorative coatings, which reflect red light and have a blueish image. Generally, high-quality telescopes are mostly blue or broadband green films.

The color of the general lens is the interference magnesium fluoride film, the color is determined by the thickness, the red film coating is slightly thicker, the green film is slightly thinner, from the visual experience, the red film is colder, and the green film is warmer.

1. The permeability is different.

Both blue and green films are regular anti-reflection coatings. But not necessarily, there is now a "false green film", which is the same as the red film. Nothing good.

Basically, blue film is a mature and cost-effective film. The permeability of green film can be improved by 1% compared with blue film.

2. The imaging effect is different.

Red film, basically without any advantages. In addition to being decorative. The imaging of the green film is good, the clarity is high, and the color reproduction is also good.

Differences: 1. The main difference between blue film, green film and red film is the color band, and the imaging degree is different for different color bands.

2. Imaging degree and advantages:

1. Green film: In some places, it is also called anti-reflection green film, which is currently one of the best coatings in China, and will present different color bands at different angles (this is the performance of multi-layer coating), with good imaging and high definition, and good color reproduction.

2. Red film: Generally only used on red dots, this is more versatile and has no characteristics.

3. Blue film: It is the most widely used coating method in China, compared with the broadband green film, it is slightly yellow and dark, and the blue film is also layered, some are plated with three layers, some are better with five layers, and the poor ones are only one layer.

The green film of a telescope is better than the red film.

Features of different coatings:

1. Red film. Red film is a coating that can make the telescope lens reflect burgundy, which achieves a balance in light transmittance and color reproduction, but in comparison, the light transmittance of red coating is not as good as blue film and green film, and the color reproduction is not as good as amber film.

2. Blue film and green film.

These two are reflected blue light and green light, which belong to the two coatings with the highest light transmittance, of which the blue film transmittance is 85%, the green film transmittance is 95%, and the latter is brighter in imaging brightness, and the color reproduction is also better than the latter, but the cost of blue film is not high, and it is more suitable for large-scale use on affordable telescopes.

3. Amber film.

The amber film reflects two kinds of light, green and red, so that the lens of the telescope appears amber, this type of coating is not as transmittant as the blue film and green film, but the color reproduction is very strong.

To sum up, when you choose a telescope, if you need a high degree of color reproduction, amber coating must be an excellent choice, in terms of color reproduction, amber coating has no competitors;If you need a high amount of light transmission, green coating is the best choice, and if you don't have enough budget but want to image clearly enough, choose blue coating, and finally red coating. <>

The green film and purple film of the telescope are two different optical coating technologies, and their main role is to improve light transmittance and reduce reflection loss, so that the image is clearer. So, for the question of which coating technology is better to use, you need to make a choice based on actual needs.

First, let's talk about the green film coating. The green film coating is composed of multiple layers of precision oxide film, which can effectively reduce reflection and diffuse reflection prematurely, and provide higher contrast and color reproduction ability while ensuring light transmittance. Therefore, if you are a professional photographer or an astronomy enthusiast, it is more suitable to choose a telescope with green film coating, as it can provide a more realistic and clear image effect visually, allowing you to better observe the starry sky or take pictures for a long time.

This is followed by a purple film coating. The main function of the purple film coating is to improve the contrast and brightness, so that the contours of the target object are more vivid and bright. Compared with the green film coating, the purple film coating has higher light transmittance and is more prominent for observation in low-light environments.

Therefore, if your main purpose is to observe natural scenes in the wild or do activities such as hunting, you can choose a telescope with purple film coating preferred.

In general, green film and purple film have their own strengths, and you can choose according to your actual needs. If Tongsuo needs higher color reproduction and contrast, it is recommended to choose green film coating; If you need to observe in a low-light environment and want to be able to see the target object more clearly and brightly, you can choose the purple film coating. Of course, when buying a telescope, you also need to consider other factors, such as lens diameter, magnification, focal length, etc., and the most important thing is to choose the right telescope for you.

Both the green and purple films of telescopes are designed to improve the clarity and contrast of the field of view, and each has its own advantages and disadvantages in different situations:

Green film: The green film telescope can reduce the reflection and scattering of light, and the beam oak makes the field of vision clearer and brighter and more uniform. It is suitable for use in low-light environments, such as astronomical observations or when observing natural landscapes outdoors.

Purple Membrane: Purple membrane telescopes can improve the contrast and make the outline of the object clearer, especially if the god makes the highlight contrast. It is suitable for use indoors or in high-light environments, such as when observing buildings or cityscapes.

In general, the choice of green film and purple film should be decided according to the specific use scenario and needs, and there is no absolute good or bad.

Hello, when choosing a telescope green film and purple film, the first thing to consider is your needs and purpose. The green film telescope is a refracting telescope, which has the advantage of providing a larger field of view, a larger space can be clearly observed, and it can provide a clearer image, but its disadvantage is that it may be affected by ambient light, making the image blurry. The purple film telescope is a kind of reflecting telescope, which has the advantage of providing higher dispersion visual quality, clearer images, and less affected by ambient light, but its disadvantage is that the visual disturbance field is smaller, and the image quality is not as good as that of the green film telescope.

In conclusion, you can choose a green film telescope or a purple film telescope according to your needs and purpose.

The telescope green film is easy to use.

The green film seems to be only available in the ninety-five style, and this kind of film is also called broadband film, which has very good performance, stronger than purple film, and has high transmittance. The effect of green film lens is better than that of purple film, and the purple shirt cherry film will appear very monotonous and boring as a monochrome film, and it is very easy to feel uncomfortable after observation and cause eye fatigue.

Reasons for telescope lens coating and how to identify quality:

Because when the light shines on the surface of the lens of the telescope, part of the light will be reflected, a typical telescope has more than 10 reflective surfaces, even if each reflecting surface only reflects a few percent of the light, plus the absorption of light inside the lens, the light that finally enters the eye may lose more than 50%, not only the imaging is dim, but also the reflected light is reflected many times inside the telescope, and some of them enter the eye through the eyepiece, forming glare, interfering with the observation, and reducing the contrast of the imaging. When the surface of the lens is coated with a 1 4 wavelength film, the light transmittance of this wavelength light can be improved, the more common blue film is the simplest anti-reflection film, and the more high-end mirror will use a multi-layer film, which can improve the light transmittance of the entire visible light band.

There are many red film telescopes on the market**, which are generally only suitable for highly reflective environments such as snow, and daily use will cause problems such as dull imaging and serious color casting. In addition, in order to reduce the cost, some mirrors are only coated on some lenses (usually the outer surface of the objective lens and eyepiece), good mirrors will be coated on all lens surfaces, better mirrors will be coated with multiple layers on the surface of some lenses, and the best mirrors will be coated with multiple layers on all lens surfaces. The easiest way to judge the quality of a mirror's coating is to observe the reflection of the lens, the darker the reflection, the more transparent the lens, and the better the coating.

Precautions for purchase:

1) The imaging effect of the telescope depends on many factors, and the magnification is only one of many factors, and it is not advisable to blindly pursue the magnification. The possibility of a fake military telescope is extremely high, and regular military telescopes are basically black and expensive.

2) Do not buy binoculars with a wide range of zoom, there are many problems such as small field of view, serious imaging distortion, and easy deviation of the optical axis. You must know that you get what you pay for, and the actual effect of a telescope with the same specifications and parameters may be very different, of course, it will be thousands of miles apart.

3) Try not to buy a red film telescope, it is only suitable for high reflection environments such as ice and snow, and the imaging in the general environment is dim and the color cast is serious.

4) There are never any infrared night vision telescopes, but some size telescopes, such as 7x50, also work well in low-light environments.

Actually, the question you are asking is not a good question, but a basic dividing line.

Red film, basically without any advantages. In addition to being decorative. Of course, for some unscrupulous vendors, it can be advertised as "night vision" and "infrared" to deceive consumers - this can be said to be a "plus" for them.

Therefore, regular products rarely use red film, so it can be considered that most of the telescopes that use the shiny mirror-like red film and yellow film are inferior products.

Both blue and broadband coatings are regular anti-reflection coatings. Basically, blue film is a traditional optical coating. The real broadband film is also good, and the permeability can be improved by less than 1% compared to the blue film, which seems to be the case in my impression, and the difference is not big.

It should be noted that you can't just look at the film, many inferior products nowadays deliberately use green coating on the obvious part of the product - just like using good paint on the outside of furniture made of broken wood to deceive consumers.

Blindly focusing on the so-called "coating" is easy to be fooled.

In short, comprehensive identification is the most important, that is, do not stare at what coating, but look at the system, now there are a lot of counterfeits, counterfeit and inferior accounted for more than 95% of the market, and there are all kinds of false propaganda, such as "night vision", "infrared", "Japanese cherry blossoms", "Russia" and so on, it is recommended that you understand the basic knowledge of basic identification.

Particular attention is paid to the issues related to multiples, military, night vision, etc., that is, the introduction of some common false propaganda. Basically, there is a more familiar understanding of these aspects, and being careful is the most important thing.

In addition, I would like to add that the hand-held one generally does not choose the zoom one.

Let's look at the light transmittance, if you distinguish from the simple color, the single layer is blue, the multiple layers are green, and the more layers show different colors from different angles, because the transmittance of the glass material to the light wave is different, so different coatings are used to improve the light transmittance of a certain wavelength band, thereby improving the overall light transmittance.

Red film, basically without any advantages. In addition to being decorative.

Of course, for some unscrupulous vendors, it can be advertised as "night vision" and "infrared" to deceive consumers - this can be said to be a "plus" for them.

Both blue and green films are regular anti-reflection coatings. But not necessarily, there is now a "false green film", which is the same as the red film. Nothing good.

Basically, blue film is a mature and cost-effective film. The real green film is also good, the permeability can be improved by less than 1% compared to the blue film, and I have the impression that this is the case, and the difference is not big.

The best film is actually the one with the darkest reflection.

It is important to note that you can't just look at the film The color cast of the real coating is very small, and you can tell if it is a real film by looking at the white target.

Both blue and green films are regular anti-reflection coatings. But not necessarily, there is now a "false green film", which is the same as the red film. Nothing good.

Basically, blue film is a mature and cost-effective film. The permeability of green film can be improved by 1% compared with blue film.

2. The imaging effect is different.

Red film, basically without any advantages. In addition to being decorative. The imaging of the green film is good, the clarity is high, and the color reproduction is also good.