What is a uv mirror?

Lead: With the development of digital technology, some users who often use cameras may be familiar with uv mirrors. When using digital cameras, reasonable use of Uv mirrors can achieve different effects. What is that, a uv mirror? Let's take a look at it next.

What is a uv mirror?

UV mirror is also called ultraviolet filter, which is ultraviolet light. Generally, it is colorless and transparent, but some of it will appear purple or purplish red at some angles because of the antireflection film. Many people buy UV mirrors to protect the precious lens coating, which is actually only an accessory function. UV mirror can weaken the blue tone caused by ultraviolet light.

For digital cameras, UV mirror can eliminate the interference of ultraviolet rays on CCD, which is helpful to improve the definition and color effect. However, due to the popularity of CMOS, the sensitivity to ultraviolet rays is greatly reduced, so now the role of uv mirrors is getting smaller and smaller, and ordinary quality uv mirrors may sometimes play a negative role.

Main functions of uv mirror

UV mirror is suitable for shooting in seaside, mountains, snowfields and open areas, which can weaken the blue tone caused by ultraviolet light. At the same time, for digital cameras, it can also eliminate the interference of ultraviolet rays on CCD, which is helpful to improve the definition and the effect of color reproduction.

In photography, UV mirrors are used to protect the lens and filter light. The lens in the camera is the most precious, so we should strengthen protection. Installing UV lenses can prevent some dust erosion, and of course it is very convenient to wipe, so don't worry about rubbing the lenses.

The lens receives light when taking pictures, just like people look at objects. Seeing things in strong light makes you uncomfortable and tired. So you put on color filter glasses, and your eyes feel much more comfortable. That's because the lens blocks some strong ultraviolet rays and allows your eyes to accept external things under negative conditions.

The same is true of the UV lens on this lens. On the one hand, it can effectively prevent the invasion of strong ultraviolet rays from causing image clarity, and on the other hand, it can prevent some air pollution from corroding the lens. When shooting film with a traditional camera.

Due to the chemical characteristics of film, it is particularly sensitive to ultraviolet rays in the sun. In places with strong ultraviolet rays, photos taken with film are generally blue and white. Seriously affected the quality of photos. Adding a UV mirror in front of the lens can effectively filter ultraviolet rays and improve the clarity of photos.

For mountain photography or aerial photography, it can make the distant scenery clearer and restore a more realistic and gorgeous picture. So at that time, the UV mirror became a necessary color filter. Because UV mirror can not only improve imaging, but also protect the lens from dust, fingerprints and other pollution. UV mirror is always installed in front of the lens without removal, which makes it the most widely used color filter.

In the digital age, because CCD, the core imaging component of digital machine, is no longer too sensitive to ultraviolet rays like film, the filtering function of UV mirror is gradually weakened, but the damage of oil pollution, fingerprints and scratches to lens coating still exists. At this time, the UV mirror is more protective. Some people worry that installing a UV mirror will affect the imaging quality.

In fact, under normal circumstances, you can't see this effect without opening your eyes carefully. If some special occasions must require high-quality pictures, you can unscrew the UV mirror and install it after shooting. When equipped with a UV mirror, an adapter ring or an adapter cylinder is needed, so the aperture of the UV mirror is involved here. The aperture of a UV mirror is usually

Distinguish true from false with uv mirror

The way to distinguish the quality of UV mirror should be to regard it as a mirror on a black background: what can't be illuminated is a good UV mirror; UV mirrors that can reflect their own shadows are all low-grade. The clearer the shadow, the worse the lens and coating. This is because the lens with high transmittance, the light is transmitted and not reflected at all, so nothing can be seen.

Authentic uv mirror handwriting is yellow, clear and uniform, while counterfeit products are mostly white, and the printing is rough. The surface paint of genuine uv mirror is even and matt, while the surface paint of fake uv mirror is very bright. You can take a closer look at the joint between the lens and the frame. Authentic uv lenses have aprons, fake ones don't, just bare lenses. You can also observe the reflection of light with a UV mirror. Authentic UV mirrors are generally lavender (just like the camera lens you see), while fake ones are more translucent (just ordinary glass sheets).

If you buy a fake filter, you will be cheated and spend more money. The key is to affect the imaging quality. Authentic UV mirrors are all made of optical glass, and the light transmittance is above 95% "professional grade reaches 99.9%". But many fake UV mirrors in China only use ordinary glass as raw material. Different materials have different effects. Ordinary glass can not only reduce the influence of lens increase on brightness, but also seriously interfere with the final imaging, especially the backlight.

UV mirror is suitable for shooting in seaside, mountains, snowfields and open areas, which can weaken the blue tone caused by ultraviolet light. At the same time, for digital cameras, it can also eliminate the interference of ultraviolet rays on CCD, which is helpful to improve the definition and the effect of color reproduction.

First: use

1, in photography, the UV mirror is used to protect the lens. The lens in the camera is the most precious, so we should strengthen protection. Installing UV lenses can prevent some dust erosion, and of course it is very convenient to wipe, so don't worry about rubbing the lenses. The lens receives light when taking pictures, just like people look at objects. Seeing things in strong light makes you uncomfortable and tired. So you put on color filter glasses, and your eyes feel much more comfortable. That's because the lens blocks some strong ultraviolet rays and allows your eyes to accept external things under negative conditions.

2. Second, it is used to filter light, and so is the UV lens on this lens. First, it can effectively prevent the invasion of strong ultraviolet rays from causing image clarity, and second, it can prevent some air pollution from corroding the lens. When shooting film with a traditional camera. Due to the chemical characteristics of film, it is particularly sensitive to ultraviolet rays in the sun. In places with strong ultraviolet rays, photos taken with film are generally blue and white. Seriously affected the quality of photos. Adding a UV mirror in front of the lens can effectively filter ultraviolet rays and improve the clarity of photos. For mountain photography or aerial photography, it can make the distant scenery clearer and restore a more realistic and gorgeous picture. So at that time, the UV mirror became a necessary color filter. Because UV mirror can not only improve imaging, but also protect the lens from dust, fingerprints and other pollution. UV mirror is always installed in front of the lens without removal, which makes it the most widely used color filter.

Second: shopping

1. Usually, UV mirrors have the following marks:

N: ordinary glass (as the name suggests)

O: optical glass (which can effectively filter ultraviolet rays and greatly enhance light transmittance)

MC: Single-layer coating (it can greatly weaken the reflection of monochromatic light (usually green light) and enhance its transmission)

HMC: multilayer coating (can weaken the reflection of polychromatic light and enhance its transmission)

To sum up, UV mirrors can be divided into:

1. ultraviolet

2. Ultraviolet (MC)

3. ultraviolet (HMC)

4. ultraviolet rays

5. Ultraviolet (oxidation)

6. ultraviolet (HMC)

The above are all kinds of signs of UV mirror.

2. When purchasing UV mirrors, it should be noted that the installation of UV mirrors cannot affect the chromatic aberration of photos taken in normal environment. After installing this filter in the camera, the wide-angle end, especially the telephoto end, can be clearly focused. If the UV mirror is not coated to enhance the transparency, its transmittance is only 90%, and the transmittance of ordinary UV mirror is about 96% if it is coated on both sides. In addition, there is a multi-layer coated MC UV mirror with a light transmittance of 99.9%, which is much better than the ordinary UV mirror and can completely retain the characteristics of the original lens.

Now UV mirrors are also improving. Take the Stander UV mirror as an example. After dripping water on the UV mirror, shake the lens by hand, the water drops will not spread out, but will only roll on the surface of the lens and will not touch the lens at all. Its ultraviolet filter has a special multilayer coating. The coating can effectively inhibit ultraviolet rays and scattered multiple reflected light,

Third: how to identify?

1, the way to identify the quality of UV should be to take a UV mirror as a mirror and shine it on a black background: what can't be illuminated is a good UV mirror; UV mirrors that can reflect their own shadows are all low-grade. The clearer the shadow, the worse the lens and coating. This is because the lens with high transmittance, the light is transmitted and not reflected at all, so nothing can be seen. If there is no black background when you buy it, the easiest way is to look at the lens as a mirror and then press uv. You can hardly see your face before installation. If your face appears clearly after uv, it is fake.