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While the Canadian Balsam used to cement lenses together can yellow, the yellow in Thorium Glass ("Radioactive") lenses is due to chemical changes in the chemicals in the glass itself. So you can have yellow lenses that are not at all "radioactive".10-Apr-2014

How can you tell if a lens is radioactive?

3:5919:41Radioactive Lenses Part 2. How dangerous are they to use/store …YouTubeStart of suggested clipEnd of suggested clipI'm concentrating on the rear element. Because when people have taken apart radioactive lenses they'MoreI'm concentrating on the rear element. Because when people have taken apart radioactive lenses they've often found that the rear glass elements are more radioactive than the front elements.

Why are some lenses radioactive?

Radioactivity in lanthanum containing lenses is due to the intentional inclusion of thorium in the optical glass mix. The presence of thorium can sometimes, depending on the mixture of other elements in the lens, cause moderate to severe browning of the lens elements.

WHAT IS lens yellowing?

When an originally clear lens begins to take on a yellow tint, it is generally considered to be a sign of age-related wear and tear. There are several reasons given for this change. In particular, this sort of yellowing is attributed to exposure to sunlight.

Why is my camera lens yellow?

The reason for the yellowing is its caused by the Thorium used within the glass which can turn yellow over time. What is thorium you ask? Thorium is a slightly radioactive metal that is used to help light pass through the lens more quickly. But over time it can cause the glass to turn yellow.

Do old cameras have radiation?

Radioactivity in old camera lenses is due mostly to the widespread use of thorium glass elements in the 1940s, '50s, '60s and '70s. Thorium oxide is highly refractive and low dispersion; this translated into cheaper high-quality glass by allowing manufacturers to make lenses of lesser curvature.

Are Nikkor lenses radioactive?

The Nikkor-N 35mm f/1.4 Auto has to be dismantled to get best results because of its radioactive-glass being situated deep-inside the lens.

What are radioactive lenses?

Thoriated glass is a glass material used in the manufacture of optical systems, specifically photographic lenses. It is useful to this process due to its high refractive index. Thoriated glass is radioactive due to the inclusion of thorium dioxide, oxide of radioactive element thorium.

Can yellow lenses be polarized?

Cyclists frequently choose yellow tinted lenses for the visual clarity that they provide, not just to look good! In fact, outdoor athletes of all kinds often opt for polarized sunglasses with yellow tinted lenses, as these lenses offer excellent depth perception, as they filter out blue light.

How do you remove yellow from lenses?

0:504:24How to Remove Yellow Tint from Radioactive Lens – YouTubeYouTube