Check the listing for details. 2pcs D16F50 2pcs D20F800 with 2 Plastic Support Rings for Each Type. Condition: New. Listed at 48.00 USD. Lens Characteristics High Transmittance and Low Loss Utilizing high - grade substrates and state - of - the - art coating techniques, light loss is significantly minimized. The transmittance rate exceeds 99.5%, thereby enhancing operational efficiency.