This 10x, 20mm diameter achromatic, aplanatic triplet is made of the fine-quality optical glass that the firm of Harald Schneider is known for. The Schneider L2 loupe provides sharp, clear, edge-to-edge distortion free viewing through its 20mm diameter lens. Includes a Schneider lanyard and a storage pouch. This 10x, 20mm diameter achromatic, aplanatic triplet is made of the fine-quality optical glass Schneider is known for, providing sharp, clear, edge-to-edge distortion-free viewing.