Адрес: 4, Jiang Wang Miao Street Nanjing,Jiangsu 210042, China
Телефон: +86-25-85282507
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This kind of lens is used to increase focal lengths in existing systems. It is more suitable than equi-concave lens if the magnification lies in the range m0.2.We specialize in the production of medium to large-size series custom lenses with exacting tolerances, high grade surface finish and difficult coatings. Please send us your specification or drawing and we will be happy to return a quotation ASAP. Our average response time is within 24 hours.Our optical designers are always available to assist with your special needs, and our factory in China is ready to meet your quantity requirements.Specifications:1) Diameter: Φ4 - 300mm2) Material: BK7 (K9), or as requested3) Surface quality: up to 60 - 40 S&D, or as requested4) Surface accuracy: up to λ/4, or as requested5) Clear aperture: >90%6) Diameter tolerance: +0.0/- (0.1 - 0.2) mm (depends on dimension)7) Focal length tolerance: ±2%8) EFL: as requested9) Surface figure: λ/4, or as requested10) Centering tolerance: 3, or as requested11) CT tolerance: ±(0.1 - 0.25)mm (depends on diameter)12) ET tolerance: as requested13) Bevel: (0.25 - 1.0mm) x 45° (depends on diameter)14) Coating: as requested
All our achromatic doublets are computer optimized to minimize aberrations and coma, and are supplied either multilayer coated or with a single layer anti-reflection coating suitable for the ultra-vio
These lenses have a large range of lengths and are the optimum shape for producingreal images at 1:1 magnification. In a single lens application you should considerusing them in preference to a single
Our ED apochromats use a very high homogeneity ED glass as the center element, fullmulti-coatings on all required surfaces, a fully temperature compensated lenscell, and zonal correcting non-equal int
Ellipsoidal mirrors have two conjugate foci. Light from one focus passes throughthe other after reflection. Ellipsoids collect a much higher fraction of total emittedlight than a spherical mirror or c
Ellipsoidal mirrors have two conjugate foci. Light from one focus passes throughthe other after reflection. Ellipsoids collect a much higher fraction of total emittedlight than a spherical mirror or c
Flat mirrors are smooth and highly polished. The flat surfaces are used for reflecting light. The actual reflecting surface is usually a thin coating of silver, aluminum, or other material. They may b
Hyperbolic mirrors are intended to form the image of object in focal plane, and normallyare used in astronomy telescopes, as well as other optical systems demandingbroadband reflection and excellent p
Meniscus lenses are often employed in conjunction with another lens to produce an optical system having either a longer or shorter focal length than the original lens.We specialize in the production o
Parabolic mirrors offer excellent correction of spherical aberrations, and are availablein both on-axis and off-axis specifications. On-axis parabolic mirrors producecollimated reflected light, while
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