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