Sell Plano-concave Lensesa

This kind of lens is to increase focal lengths in existing systems. It is more suitable than the equi-concave lens if the magnification lies in the range m0.2. Our optical designers are always available to assist with your special needs and our production in China is ready to meet your quantity requirements. We specialize in production of medium to large-size series of 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. Specifications: 1) Diameter: Φ25.4-Φ300mm 2) E.F.L: as requested 3) Wavelength: as requested 4) Material: BK7 (K9) or as requested 5) Clear aperture: >90% 6) Bevel: (0.25mm -1.0mm) x 45° (depends on dimension) 7) Diameter tolerance: +0.0/-(0.1-0.2) mm (depends on the diameter) 8) Focal length tolerance: ±2% 9) Centering tolerance: 3\'\' or as requested 10) Surface figure: λ/4 or as requested 11) Surface quality: up to 60-40 S&D, or as requested 12) C.T. tolerance: ±(0.1-0.25) mm (depends on the diameter) 13) E.T. tolerance: Reference 14) Coating: as requested (Minimum Quantity Per Order: 20 pcs forΦ≥100mm, 50 pcs forΦ<100mm )