Double convex lens consists of two convex surfaces of equal radius that focus light into a single point with a positive focal length. Due to the symmetrical shape of the two sides, it is a more suitable unit for 1:1 imaging applications. It is often used in imaging relay system, object imaging under finite conjugate distance or beam focusing, collimation, beam expansion, etc. The characteristics of convex lenses are that the greater the conjugation ratio, the greater the aberration generated.
| SPECIFICATION | |
| Material | BK7 or Fused Silica |
| Design Wavelength | 546.1nm |
| Design Index | 1.5183±0.0005 |
| Diameter Tolerance | +0.00/-0.15mm |
| Thickness Tolerance | ±0.2mm |
| Paraxial Focal Length | ±2% |
| Centration | <3 arc minutes |
| Clear Aperture | >85% |
| Surface lrregularity | λ/4@632.8nm |
| Surface Quality | 40-20 scratch and dig |
| Protective Bevel | 0.25mm x 45° |
| BK7 Double Convex Lens | ||||||
| Part No. | f (mm) | φ (mm) | R1=R2 (mm) | Tc (mm) | Te (mm) | fb (mm) |
| SDX101 | 8.0 | 6.0 | 7.7 | 3.2 | 2.0 | 6.9 |
| SDX102 | 10.0 | 10.0 | 9.45 | 4.9 | 2.0 | 8.2 |
| SDX103 | 20.0 | 12.7 | 20.01 | 4.0 | 2.0 | 18.6 |
| SDX104 | 50.0 | 12.7 | 51.35 | 2.8 | 2.0 | 49.1 |
| SDX105 | 75.0 | 127. | 77.30 | 2.6 | 2.0 | 74.1 |
| SDX106 | 100.0 | 12.7 | 103.25 | 2.4 | 2.0 | 99.2 |
| SDX107 | 25.4 | 20.0 | 252.265 | 6.1 | 2.0 | 23.3 |
| SDX108 | 25.4 | 25.4 | 24.712 | 9.0 | 2.0 | 22.2 |
| SDX109 | 50.0 | 25.4 | 50.92 | 5.2 | 2.0 | 48.3 |
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