Product Name: Achromatic Lens Glass Material for Optical Instruments, Edge Blackened Coating: Ar Coating,IR Coating,UV Coating Customized: Customized Lenses Color: Clear Material: Bk7,Fused Silica,Jgs1,Jgs2,Jgs3 Shape: Achromatic Lens Transmittance: >95% Type: Achromatic Usage: Lighting, Medical, Optical, Photography Trademark: Realpoo Transport Package: Protective Packing Specification: 16*16*16cm Origin: Cn HS Code: 9001909090 Product Description Achromatic Lens:Why use an Achromatic lens? An achromatic lens or achromat is a lens that is designed to limit the effects of chromatic and spherical aberration. Achromatic lenses are corrected to bring two wavelengths (typically red and blue) into focus on the same plane.The most common type of achromat is the achromatic doublet, which is composed of two individual lenses made from glasses with different amounts of dispersion. Typically, one element is a negative (concave) element made out of flint glass such as F2, which has relatively high dispersion, and the other is a positive (convex) element made of crown glass such as BK7, which has lower dispersion. The lens elements are mounted next to each other, often cemented together, and shaped so that the chromatic aberration of one is counterbalanced by that of the other.Achromaticlensesarewidelyusedtodayinachromatictelescopes,microscopes,andphotographiclenses.Specificationsof Achromatic Lens: Material:CrownGlass&FlintGlass DiameterTolerance:+0.0,-0.05mm CenterThicknessTolerance:±0.1mm SurfaceQuality:40-20scratchanddig Centration:±1arcminutes SurfaceFigure:lambda/4@632.8nm ClearAperture:>85%ofdiameter Bevel:0.25x45deg Coating:Uponrequirement Notes:Wewillprocessasthedrawingsandrequirementsrigorously.Ourengineerwillcheckordesignthedrawingsaccordingtothedetails.Inaddition,wehavesomestocklensesforyouroption.