NTT Makes '1,000x Faster' Variable Focus Lens

The KTN-based variable focus lens element. A single unit works as a cylindrical lens. It looks opaque because the transparency of KTN varies with the temperature. And the photo was taken at a temperature at which it does not become transparent.

The KTN-based variable focus lens element. A single unit works as a cylindrical lens. It looks opaque because the transparency of KTN varies with the temperature. And the photo was taken at a temperature at which it does not become transparent.

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