Special Features:

6material used in the manufacture of this optical part shall not containthorium, other radioactive material, or any combination of nuclear materials in excess of 0.05 percent by weight as defined by the title 10, code of federal regulation, part 40.The infrared antireflective coating is excluded from this restriction and contains thorium approximately 0.0011 grams per square centimeter of coated surface.In addition, the amount of thorium used will be reported in accordance with specification sm-a-807570

Properties:

An unmounted, transparent, color free lens which may be treated with a low reflection coating to increase light transmission. Includes single and compound elements. For items having two plane parallel surfaces, see window, optical instrument. Excludes reticle, optical instrument.