T-LF5067-E - Ø1/2" CaF2 Negative Meniscus Lens, f = -20.0 mm, AR-Coated: 2 - 5 µm
T-LF5067-E - Ø1/2" CaF2 Negative Meniscus Lens, f = -20.0 mm, AR-Coated: 2 - 5 µm
- Vacuum-Grade Calcium Fluoride Substrate
- Ø1/2" and Ø1" Versions Available
- Broadband AR Coating for the 2 - 5 μm Range
- Focal Lengths from -20.0 mm to -1000.0 mm
- Diameter 1/2" (12.7 mm)
- Focal Length -20.0 mm
- Diopter -50.0
- Radius of Curvature 1 95.6 mm
- Radius of Curvature 2 7.5 mm
- Center Thickness 2.0 mm
- Edge Thickness 5.3 mm
- Back Focal Length -19.9 mm
- AR Coating <1.25% Ravg from 2 - 5 μm
- Reference Drawing Click to see
- Focal Length @ 4 µm -20.0 mm
| AR Coating Range | 2 - 5 μm |
| Reflectance over AR Coating Range @ 0° AOI |
Ravg < 1.25% |
| Diameters Available | 1/2" or 1" |
| Diameter Tolerance | +0.00/-0.10 mm |
| Thickness Tolerance | ±0.1 mm |
| Focal Length Tolerance | ±2% |
| Surface Quality | 40-20 (Scratch-Dig) |
| Spherical Surface Power | 3λ/2 |
| Spherical Surface Irregularity (Peak to Valley) |
λ/2 |
| Centration | <3 arcmin |
| Clear Aperture | >90% of Diameter |
| Design Wavelength | 4 μm |