The PAC076 Visible Achromatic Triplet Lens is a 400 to 700 nm antireflection coated, 1.5 inch (38.1 mm) diameter, BaSF 2, SF 3, and BaSF 2 precision achromatic triplet lens with an effective focal length of 125 mm. This triplet is optimized for 1:1 imaging, and is diffraction limited at 488, 514.5, and 632.8 nm. This achromat is computer designed to effectively minimize spherical aberration and coma when operating at infinite conjugate ratio, yielding smaller focused spot sizes. Unlike singlet lenses, this results in a constant focal length independent of aperture and far better off-axis performance. Achromats are superior to singlet lenses for monochromatic applications at any visible wavelength.
| Model | PAC076 |
|---|---|
| Lens Shape | Plano-Convex |
| Lens Type | Achromatic Doublet |
| Effective Focal Length | 125 mm |
| Diameter | 1.5 in. (38.1 mm) |
| Lens Material | BaSF2/SF3/BaSF2 |
| Antireflection Coating | 400-700 nm (MgF2) |
| Surface Quality | 40-20 scratch-dig |
| Clear Aperture | ≥central 90% of diameter |
| Diameter Tolerance | +0/-0.1 mm |
| Te | 18.5 mm |
| Edge Thickness (Te) Tolerance | Nominal Value |
| Center Thickness (Tc) | 21.6 mm |
| Tc2 | 3.6 mm |
| Center Thickness (Tc) Tolerance | ± 0.3 mm |
| Focal length tolerance | ±2 % |
| FFL | 117.5 mm |
| BFL | 117.5 mm |
| f/# | 3.3 |
| R | 117.307 mm |
| R2 | -/+48.297 mm |
| R3 | -117.307 mm |
| Wavelength Range | 400 to 700 nm |
| Surface Accuracy, Irregularity (lambda) | λ/4 |
| Cleaning | Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended |
