Coated with FGMC Blue Film It can be used on DIY Astronomic Telescope Objective, DIY guidscope Combined image quality: 1/4-1/8 Diameter tolerance: +0/-0.12 mm Center thickness tolerance: ±0.2mm Focal length tolerance: ±0.1% Finish: 60/40 Eccentricity: 1' Package includes: 1pc Achromatic Doublet Convex Lens. Return or Exchange
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