$11.50
Specifications:
| Lens Form | Biconcave Lens | Material | N-BK7 |
| Diameters(mm) | 12.7(+0.0/-0.1) | Design Wavelength(nm) | 587.6 |
| Effective Focal Length EFL(mm) | -25.00±1% | Back Focal Length BFL(mm) | -25.81 |
| Coating | Uncoated | Surface Quality(S/D) | 40/20 |
| Irregularity@632.8nm | λ/4 | Centration Error(arc min) | ≤2 |
| Center Thickness | 2.5±0.1 | Edge Thickness | 4.1±0.1 |
| Curvature Radius R1 | -26.17 | Clear Aperture | 90% |
| Protective Chamfer | 0.2mmx45° | Wavelength Range(nm) | 350-2200 |
Dia12.7mm EFL-25mm N-BK7 Biconcave Lenses Uncoated, Code: 1108-006
Biconcave Lenses or Double Concave Lenses are optical lenses with two inward-bent spherical surfaces of identical radii of curvature. A double concave lens has a negative focal length and diverges a collimated light beam to the virtual focal point and increases the focal lengths of a lens group.
This catalog features Shalom EO’s Off-the-shelf N-BK7 Biconcave and UV Fused Silica Biconcave Lenses.
