Fluorite

October 7, 2016

Fluorite is a natural crystal with three special properties that make it effective for lens manufacturing. It transmits well infrared and ultraviolet light, has an ultra-low refractive index and weak dispersion properties.

What does this mean for photographers? When light passes through a lens, it refracts, that is, bends. It also breaks down into its constituent colors, just like passing through a prism. The lower the refractive index of the lens material, the less bending the light will be, resulting in a sharper image. Moreover, due to its weak dispersion properties, light is not so clearly broken down into components, which makes it possible to more effectively cope with chromatic aberration.

Chromatic aberration is inherent in glass lenses. This problem occurs because the lens is unable to bring light of different wavelengths to the same focal point, which in the worst cases results in a color fringing around the contours of the object. Fluorite lens elements have a lower refractive index to minimize this effect.

Fluorite, aspherical, UD and BR lenses

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