Combined image quality 1/4-1/8 Diameter tolerance + 0/-0.12 mm Center thickness tolerance ± 0.2mm Focus tolerance ± 0.1% Finish 60/40
Eccentricity 1 Remarks: Two-piece refraction-type double-separation objective lens set; An objective len and a collimating objective lens for an astronomical telescope;
وصف
154mm Aperture Series Double Separation Objective Lens-DIY Self-made and Assembled for Refractive Astronomical Telescope