Four-unit zoom lens system having a high zoom ratio

Fourier transform lens assembly

Fresnel lens

Fresnel lens

Fresnel lens and an illuminating device provided with the...

Fresnel lens for projection screens

Fresnel lens sheet and rear projection screen

Fresnel lens sheet, process of producing Fresnel lens sheet,...

Fresnel lens with aspheric grooves

Fresnel lens with cavities

Fresnel lens, backprojection screen, and corresponding...

Fresnel magnifying lens cardholder

Fresnel magnifying lens for forming a hand-held pocket-sized hyb

Fresnel optical element and projection display apparatus

Fresnel optical element and projection display device

Friction connector for optical flats in interferometers

Front converter lens

Front converter lens system using a diffractive surface

Galileo type stereomicroscope and objective lens thereof

Galvanoplastic optical mounting