I am looking for double concave achromatic lens with the following specifications :
Structure : Plano/Double, Concave/Convex
Materials : BK7/Quartz/Infrared/Sapphire, Ge, Si, ZnSe, CaF2, etc.
Diameter : 1.5-300mm
Radius : >0.8mm
Focal Length : -30000mm-30000mm
Regards
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