InstantCineWisdom – Radioactive Vintage Lenses #Short

Some Vintage lenses are radioactive due to the use of Thorium dioxide before a ban in the mid 70s.
Thorium 232 is a metal that has a high refraction index, and spiking lens elements allows for lighter and cheaper optical designs with low aberration and distortions.
The Canon FD 55mm Aspherical shows more than 30.000 radioactive decays per minute on the front element. The Decay chain contains progeny isotopes that emit alpha, beta, and gamma radiation, so, a lens cap or even a metal door will not shield you from all radiation.
Holding this lens directly at your head for an hour will expose you to radiation comparable to a dental X-ray. While that sounds dramatic, regular use is not a medical concern, But lenses shouldn’t be stored in proximity to humans. There is no known dangers to modern CMOS sensor. Still, it is recommendable not to store radioactive lenses mounted to a camera.
Radioactive lenses can get a visible amber tint over time. This is a crystallographic defect called F-center. This can be cured by exposing the lens element to UV-light
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