Shulou(Shulou.com)11/24 Report--

For some old photography enthusiasts, they should have heard that some of the old lenses are highly radioactive, which is not sensational. Earlier, the optical glass in the high-end lens did use radioactive elements.

But in the final analysis, it also has something to do with people's pursuit of large aperture and picture quality.

Since photography entered into daily life, people's pursuit of large aperture is endless. For many professional photographers and photography enthusiasts, f1.4 and f1.8 are no longer enough. Their goal is to approach, reach or even exceed f1.0 infinitely.

Not only photographers are flocking to the large aperture, but camera manufacturers are also racking their brains to continuously improve the aperture and camera imaging quality, and strive to create the final version of the "essence of human optics."

As we all know, as precision optical elements, camera lenses are expensive not only because of the complex manufacturing technology, but also because of the use of some rare elements. however, there is no shortage of radioactive dangerous chemicals in these elements.

In the 1940s and 1970s, some lens manufacturers used such chemicals, such as thorium dioxide and lanthanide, when making optical glass for better optical display.

Thorium dioxide is used to make high temperature ceramics, atomic energy fuel, incandescent lamp, electron tube cathode, arc melting electrode, optical glass, as well as refractory and catalyst. At the same time, it is also a highly radioactive element.

Apart from the dose, the toxicity is all rogue, and its specific radiation value and harmfulness can not be accurately evaluated. However, through consulting and consulting, it is found that when thorium dioxide and lanthanide are used in the lens, they are mainly alpha-rays, and the penetration power is relatively low. the attenuation rate in the air is also relatively fast, if it is not close to the body for a long time, basically will not cause problems.

Some people have made a series of measurements on their own collection of lenses (Taikuma, etc.), and their radiation levels have indeed exceeded the standard; others have measured and calculated that if they are exposed to them for a few hours a day, after a year, it is equivalent to doing a chest X-ray, and it feels good, after all, who will sleep with a bunch of old lenses every day.

However, it should also be noted that when using these lenses, if we often use our eyes close to the viewfinder for a long time, there will be some impact.

Secondly, if we have an accident when carrying or storing, resulting in damage to the lens structure or even glass fragments, it is still dangerous.

If there are old people or children at home, you should also pay attention to keeping a distance from these old lenses. After all, everyone has a different physique.

Some people may have negative psychological implications, but they don't have to play with it once in a while, just put it in a closed place and keep it.

There is no news that every photographer has health problems caused by this kind of lens, but it has been suggested that only Araki's dead wife may have something to do with it. Bad evaluation, can only share with you as far as possible the relevant information recognized, welcome to have the relevant knowledge of the boss to provide you with accurate knowledge.

Here is a list of lenses that may contain excess radiation. Friends who collect old lenses can refer to them.

The above list comes from @ photographer. Now we don't have to worry about large-aperture and large-frame lenses. These highly radioactive "antiques" have gradually become collectibles, and it's hard to get them.

At present, the camera basically does not have these problems, to say the least, if there is really a big problem, it will not reach the hands of users.

Finally, we should remind the friends who have these lenses: first, don't worry too much, second, pay attention to the frequency and distance of use, and third, pay attention to the proper preservation of the lens.

This article comes from the official account of Wechat: play some Photography (ID:wakexiao), by AGER

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