1) Refractive index ND: 1.523 2) Density: 2.533 3) Abbe number: 60.5 4) Visible light transmission rate: 92% 5) Color: White, Photo brown, Photo grey 6) Diameter: 65mm/28mm 7) Power: 0.00 to +3.00/-2.00, add +1.00 to +3.00 8) Uncoating, Multi-coated(AR), AR&EMI treatment available in greenish and bluish color 9) Both finished and semi finished Skype: clearoptical