Double-Convex Lenses
Double-Convex Lenses
| BK7, FS, UVFS, CaF2, ZnSe, Si, Ge |
| +0.0, -0.15mm |
| +-3% |
| <3 arc minutes |
| >90% |
| 0,25mm@45deg |
| λ/[email protected] |
| 40-20 scratch & dig |
| 632.8 nm |
| None. Please refer to the Coating Section |
Biconvex lenses are used as magnifiers, objectives, condensing systems.
Since both surfaces contribute to the power of biconvex lenses, they have shorter focal length than PCX lenses of equal diameter and surface radius. Lenses
can be anti-reflection coated (please refer to the
Coatings section).
Properties (Diameter D, Focal length L)
| D, mm | D, Inches | L Minimal, mm | L Maximal, mm | | 12,7
| 0.5
| 12
| 10.000
| | 25,4
| 1
| 25
| 10.000
| | 38,1
| 1.5
| 40
| 10.000
| | 50,8
| 2
| 50
| 10.000
| | 76,2
| 3
| 75
| 10.000 |
|
| Altechna metrology lab applies following product inspection: |
| Visual inspection – surface quality evaluation according to MIL 13830 and ISO 10110 standards |
| Dimensions – measurement of geometrical dimensions, as diameter, thickness, etc. |
| Radius of Curvature (Spherometer)* |
| Effective Focal Length (Spherometer) |
| Centering (Centration unit) |
| Irregularity (Interferometer) |
| Wavefront distortion (Interferometer) |
*(…) used equipment
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