Plano-concave Lens has a negative focal length, diverges collimated incident light, and forms only virtual images which are seen through the lens. It is often used to expand light beams or increase focal lengths in existing systems.
|Material:||N-BK7, Fused silica|
|Clear aperture:||> 90% of diameter|
|Centration:||< 3 arc minutes|
|Surface quality:||60-40 scratch and dig|
|Coating:||with or without AR coating|
*Capability is subject to the change of material used and dimension.