Convex Doublet Lens Optics Glass Lenses Optical Element Lens

Specification

Optical Glass Diameter 42mm Focal Length 143mm Optics Double Convex Lens

Material: K9 + ZF2 Optical Glass

They are suitable for DIY production of binoculars, finder mirrors and small astronomical telescopes.

Coating|: multilayer film 400-700nm,

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,

Eccentric: 1' ,