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.
Photonchina Specifications
Material: | BK7 or other materials |
Diameter Tolerance: | +0.0/-0.1mm |
Paraxial Focal Length: | ±1%-2% |
Centration: | 3 arc minutes |
Surface Figure : | l/4 @ 632.8 nm |
Surface Quality: | 40/20 |
Clear Aperture: | >80% |
Bevel: | <0.25mm X 45° |
Coating: | Upon customer’s request |