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Time is an important parameter in all processes. Exposure to any kind of radiation is a cumulative process. Like photo paper exposed to light, we get the same effect, the same gray, in two ways. Or with a lot of light, but extremely short time or little light, but for a long time.

 

Working a lot on your cellular phone or tablet will result in those exposure shots.

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As you can see, those almost straight lines, leaving the tips of their fingers, are positioned just under the nail.