Specifications:

• Usage: optical experiments, homemade telescopes, projectors, etc.
• Tolerance: +-0.1
• Surface: 60-40
• Structure: Plano-convex
• Shape: Aspheric
• Model Number: TJ-10-42
• Material: K9 optical glass
• Lens Diameter: 42 mm
• Intermediate Thickness: 8.2 mm
• Focal Length: 40 mm
• Edge Thickness: 2.03 mm
• Brand Name: WALLY SKY
• Angle Tolerance: +-3