4pcs Optical Convex Condenser Lens: 69mm Transparent Flat Convex Glass Lab
5pcs Convex Lenses for Telescope - 69mm Smooth Surface Optical Glass
3pcs Flat Convex Lens: 69mm Plano Convex Glass Element High Purity Optical
2pcs Optical Convex Condenser Lens: 69mm Transparent Flat Convex Glass Lab
