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.