Sell Plano-Concave Lenses

Product Name: Plano-Concave LensesPlace of Origin: ChinaThis 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 - 300mm 2) Material: BK7 (K9), or as requested 3) Surface quality: up to 60 - 40 S&D, or as requested 4) Surface accuracy: up to λ/4, or as requested 5) Clear aperture: >90% 6) Diameter tolerance: +0.0/- (0.1 - 0.2) mm (depends on dimension) 7) Focal length tolerance: ±2% 8) EFL: as requested 9) Surface figure: λ/4, or as requested 10) Centering tolerance: 3\'\', or as requested 11) CT tolerance: ±(0.1 - 0.25)mm (depends on diameter) 12) ET tolerance: as requested 13) Bevel: (0.25 - 1.0mm) x 45° (depends on diameter) 14) Coating: as requested