Technical Details. Diopters: 40D. Focal Distance (cm): 2.5. Focal Distance (inch): 1. Lens Diameter: 15.8. Power: 10x.

Product Description: 3 Separate lenses, bonded together to form a compound lens, provide sharp, very distinct magnified images - with no color distortion. A swing-away, nickel-plated case protects the lens and serves as a handle. Product Details: Shipping Weight: 6.4 ounces