Telescope Optics Blank K9 Optical Float Glass Newtonian Primary Mirror DIY Lens Craft your own high-quality Newtonian reflector telescope with this precision-cut raw glass blank. Available in 153mm and 203mm diameters, this primary mirror blank is made from optical-grade K9 float glass, ideal for grinding and polishing into a custom telescope mirror. With excellent clarity, low internal stress, and stable thermal expansion, it's a top choice for amateur astronomers and optics enthusiasts building their own reflecting telescopes. Item: Telescope Objective Lens Type: DIY Telescope Parts Material: Glass Size: The thickness of float glass is 18.5mm, K9 glass Thickness about 20mm. Structure: Plano-convex Feature: K9 optical glass float glass Package Included: 1 x Pc Telescope Objective Lens .
eBay