Ultraviolet look or tanning problems
I think many of us have heard that spending a lot of time in the sun is bad. Of course, the soft golden hue of the skin is for many more attractive than the snow-white version, but you need to clearly understand that everything is not so simple. If you are naturally light-skinned, then UV exposure should be avoided as much as possible. Otherwise, photo-aging of the skin, increased risk of melanoma and other “joys” will be a “bonus” to tanning.
Thomas Leveritt , an English artist, was able to visually demonstrate what happens to us because of the ultraviolet rays. We used a special camera, the optical system of which is transparent to ultraviolet. Such optics are extremely expensive, since the lenses must be made of special quartz glass.
at 2:50, the difference between photocomposite fillings in a different spectrum is clearly seen. The girl almost does not see the material from which it is made. Pay attention to the right central incisor in the normal and UV spectrum
Nikon UV-Nikkor 105mm f / 4.5 (Ai-S) - an extremely rare macro lens for 35 mm Nikon F SLR cameras designed for special shooting in the range of soft ultraviolet. Issued more than three thousand copies.
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The wavelengths of UV radiation are in the range from 10 to 400 nm. Usually there are three main ranges:
1) Ultraviolet A, longwave range 400 nm - 315 nm
2) Ultraviolet B, medium-wave 315 nm - 280 nm
3) Ultraviolet C, shortwave 280 nm - 100 nm
4) Extreme 121 nm - 10 nm. We do not consider this range, since it is completely absorbed by the atmosphere. (Thanks NeGO for the addition)
As is known, with increasing frequency, the photon energy increases, and hence the damaging effect. But with increasing frequency, the penetration depth also decreases. As a result, the shortwave spectrum causes severe superficial burns (a quartz lamp), and the longwave spectrum penetrates deep into the skin, causing damage and mutations in the growth zone. It is he who is responsible for photo-aging and potential oncology.
Thomas Leveritt , an English artist, was able to visually demonstrate what happens to us because of the ultraviolet rays. We used a special camera, the optical system of which is transparent to ultraviolet. Such optics are extremely expensive, since the lenses must be made of special quartz glass.
at 2:50, the difference between photocomposite fillings in a different spectrum is clearly seen. The girl almost does not see the material from which it is made. Pay attention to the right central incisor in the normal and UV spectrum
Some theory
Nikon UV-Nikkor 105mm f / 4.5 (Ai-S) - an extremely rare macro lens for 35 mm Nikon F SLR cameras designed for special shooting in the range of soft ultraviolet. Issued more than three thousand copies.
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The wavelengths of UV radiation are in the range from 10 to 400 nm. Usually there are three main ranges:
1) Ultraviolet A, longwave range 400 nm - 315 nm
2) Ultraviolet B, medium-wave 315 nm - 280 nm
3) Ultraviolet C, shortwave 280 nm - 100 nm
4) Extreme 121 nm - 10 nm. We do not consider this range, since it is completely absorbed by the atmosphere. (Thanks NeGO for the addition)
As is known, with increasing frequency, the photon energy increases, and hence the damaging effect. But with increasing frequency, the penetration depth also decreases. As a result, the shortwave spectrum causes severe superficial burns (a quartz lamp), and the longwave spectrum penetrates deep into the skin, causing damage and mutations in the growth zone. It is he who is responsible for photo-aging and potential oncology.
Source: https://habr.com/ru/post/233507/
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