4. Optical: systems and elements
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  6. Selective magnification by exchanging or adding a lens...
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Focal length changeable lens

Optical: systems and elements – Lens – Selective magnification by exchanging or adding a lens...
Patent

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Focal length changeable lens system

Optical: systems and elements – Lens – Selective magnification by exchanging or adding a lens...
Patent

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Focal length transitional method, auxiliary lens for transiting

Optical: systems and elements – Lens – Selective magnification by exchanging or adding a lens...
Patent

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Front converter lens

Optical: systems and elements – Lens – Selective magnification by exchanging or adding a lens...
Reexamination Certificate

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Front converter lens system using a diffractive surface

Optical: systems and elements – Lens – Selective magnification by exchanging or adding a lens...
Patent

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