Flat concave lens:
Flat concave lenses are suitable for situations where one conjugate distance is more than five times the other conjugate distance. They introduce negative spherical aberration and can be used to balance the spherical aberration introduced by a single lens with positive focal length.
| design wavelength | 632.8nm |
|---|---|
| Focal length tolerance | ±1% |
| Profile Tolerance | +0.0/-0.1mm |
| Tolerance | ±0.1mm |
| Facial shape | λ/4@632.8nm |
| finish | 60/40 |
| eccentric | ＜3arc min |
| Effective aperture | ＞90% |
| Chamfer | ＜0.2×45° |
| effective focal length | -25.00 |
| Outer diameter | 12.70 |
| coating film | A：BBAR Ravg ＜ 1% |
| material | H-K9L(Schott BK7) |
| Curvature radius | -12.88 |
| back focal length | -26.98 |
| Center Thickness | 3.00 |
| Edge thickness | 4.70 |
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