Germany''''''''s Shande Optical Glass, SMC coating（Increasing, waterproof, scratch -resistant, pollution -proof）, Copper circle（Spring into the lens is smooth, not hurting the lens thread）52-82 is a copper circle, 40.5-49 is aluminum ring, the lens quality is the same.

(Due to the different batch of production, the copper ring includes early white silk marks, now laser marking yellow characters, and the two versions are genuine）

UV mirror is also called ultraviolet filter, which is Ultraviolet. Below 400nm is the ultraviolet band, which is usually colorless and transparent. However, some of them are green, purple or purple -red because they add a diarrhea relationship. The color of the coating does not mean that it is plated. It seems more popular now. Many people buy UV mirrors to protect the delicate lens coating. In fact, this is just a subsidiary function. UV mirrors can weaken the blue tone caused by ultraviolet rays. At the same time, for digital cameras, it can also exclude the interference of UV rays to CCD, which helps improve the effect of clarity and color.

Many people don''''''''t know much about the importance of filters. In fact, the surface of each mirror group inside most lenses is arc surface, and there is no plane as prone to large -scale reflection. Because the filter is at the forefront of the lens, and the filter is prone to dust and oil stains, in fact, the filter is the most prone to glare. So most of the most obvious and brightest light spots you see in the photos are caused by the filter at the forefront of the lens.
Theoretically, the best optical quality that it can achieve without a filter is obtained. But for many fields in many fields, a good UV mirror is still a very realistic way to protect the lens. For example, I will never cover the camera after taking the camera out of the bag, and it depends on the UV mirror to protect the front group of the lens. Of course, the UV mirror will definitely be more diligent, but it will not delay the shooting opportunity. My logic is that I often take pictures of interesting things, and if I raise the camera and find that I forgot to pick the lens cover, compared to the loss of the missed photos, changing a piece of UV every two years to change the UV needs every two years. Hundreds of dollars can be ignored.
Since entering the digital era, especially now that the 135 camera enters 20 million pixels, compare the film era, the requirements for the lens are actually higher. If you use a good lens, it is very necessary to use good UV mirrors, and you should even use a UV mirror that is better than the lens itself. If a good UV mirror is used in a good lens, it will seriously affect the quality of imaging, which is actually similar to a lens directly.

Good brand filters such as B+W, Lotus, Bresson and other high -quality brand filters. For digital cameras, the lens has excellent multi -layer coating process, which can weaken the CCD reflection. Compared with ordinary filters, it will be better Imaging quality.

Material and processIt is very important to the filter. There must be no stripes in the glass. There should be very good light transmission and optical transmission. The surface of the glass must be rigorously polished, and the parallelism on the front and back of the side must be very harsh. The surface must be absolutely parallel and a perfect smooth surface. Any irregularity will cause astigmatism and softening effect. The inferior UV mirror has not been polished and not even coated. It does not use special optical glass, and directly uses window glass materials（Represented by a domestic brand）Although the price is low, the effect can be imagined.

Material:Ultra -thin lens can get better light transmission, and slightly reduces the refraction ratio when the light is passed through the glass. It will be more meaningful for wide -angle and ultra -wide -angle, which is conducive to reducing the scattered edge. B+W, Rock Donster, Bresson uses German Schott Glass. Shot（Schott）It is the best glass product company in the world, including Hasu V series and most of the Zeiss lens used by most Kangtai.

Coating:B+W was the first manufacturer to use multi -layer anti -pollution -resistant coating. Lotusde and Bresson followed up this technology. At present, many high -end UV mirrors also use this technology. Excellent filter generally has multiple layers of coating, which increases, anti -fingerprints, pollution -proof, waterproof, and scratching, which is conducive to usual maintenance. Under harsh conditions in the wild, it can easily clean the lens and not affect the quality of the imaging.

52mm-82mm caliber isCopper circle black circleExterior,49mm is the appearance of the aluminum ring black frame in Phnom Penh, the lens is the same.

Different from the digital camera and film machine, CCD/CMOS will reflect light. If you encounter inferior lens or mirror, it is easy to produce mixed light and ghost shadow and glare. That''''''''s why, use a good lens+bad UV mirror = a different lens. Bresson series filters, for digital optimization, effectively inhibit mixed -light interference from CCD/CMOS, making your camera imaging better.

Please see the shadow friends who use the post -evaluation: