PARAMETER: Achromatic Lenses are used to minimize or eliminate chromatic aberration. The achromatic design also helps minimize spherical aberrations. Achromatic Lenses are ideal for a range of applications, including fluorescence microscopy, image relay, inspection, or spectroscopy. An Achromatic Lens, which is often designed by either cementing two elements together or mounting the two elements in a housing, creates smaller spot sizes than comparable singlet lenses. Specification Material,Crow glass & Flint glass Diameter,6.0mm-200mm Diameter Tolerance,±0.1mm Thickness,5mm-50mm Thickness Tolerance,±0.05mm Surface Quality,60/40 40/20 Surface Flatness,lambda~lambda/8 Bevel,0.25mm*45° Centration, < 3arc min Coating, as the customer's requirement