Sell plano-concave lens @China (Mainland)

They  have a negative focal length, is used to diverge a parallel light beam.

Material:BK7,UV-grade fused silica

Size:3mm-220mm

Thinkness Tolerance:±0.1mm

Centration:3 arc min　

Surface figure:1λ

Surface quality:60—40scratch and dig

Clear aperture:90％

Coating:avaliable upon request

Post by Yan Zhang    Electronic Components & Supplies    @2011-12-20 16:24:02