eBay

Beautiful, vintage 9-inch diameter solid glass convex optical lens featuring a short, powerful focal length of approximately 12 inches. This is an exceptionally heavy, high-quality thick glass element originally designed as an industrial light condenser or projection optic. Flat on one side, convex on the other.

Perfect for amateur telescope makers (ATM projects), alternative-process darkroom photo enlarger restoration, custom steampunk lighting, or as a massive industrial desk magnifier statement piece.

Item Physical Traits:

Diameter: 9 Inches
Focal Length: ~12 Inches (brings overhead light source to a sharp focus at roughly one foot away).
Weight: 5.8 Pounds solid optical-grade glass.

Due to the immense weight and fragile nature of this 9" glass optic, it will be wrapped extensively in heavy-duty bubble wrap and securely double-boxed.