Double Concave Lenses
Double-Concave Lenses have two inward curved surfaces and a negative focal length. They are used for image reduction and to spread light.
This negative lens has the form most suitable to producing divergent light or a virtual image, where the input light is converging
Materials like BK7, Fused Silica, Sapphire, CaF2 are all available in Photonchina.
|Material:||BK7 or other materials|
|Paraxial Focal Length:||±1%-2%|
|Centration:||3 arc minutes|
|Surface Figure :||l/4 @ 632.8 nm|
|Bevel:||<0.25mm X 45°|
|Coating:||Upon customer’s request|