Specifications D=Diameter ? 0.25 mm < 40 mm ? 0.50 mm 40 to 100 mm ? 1.0 mm > 100 mm F= Effective Focal Length ?7% CT=Central Thickness ?0.5mm ET=Edge Thickness ?0.5 mm Material : As per customer's requirement Centration : 3 arc min. Surface Quality : Mil-0-13830/80-50 Anti Reflection Coated |