YOKIVEDouble Concave Lens, Clear Glass Optical Lenses | Make Telescope, Great for Photography, Optical Instruments Use (Clear, 150mm Focal Length)

YOKIVE Double Concave Lens, Clear Glass Optical Lenses | Make Telescope, Great for Photography, Optical Instruments Use (Clear, 150mm Focal Length)

EISCO 6pc Optical Lens Set, 2" (50mm) Diameter - 3 Double Convex Lens & 3 Double Concave Lens - 200mm, 300mm, 500mm Focal Lengths - Optically True Glass - Ground, Beveled Edges

Amlong Crystal Premium Optical Glass Double Convex and Concave Lens Set, 75mm Diameter, 20cm Focal Length, 2 Pieces Set