Double-Convex Lenses
Description
Double convex lenses are symmetrical, having equal radius on both sides.
They are recommended for virtual imaging of real objects, and for positive conjugate ratios from 0.2 up to 5. Outside of this ratios range plano-convex lenses are usually more suitable. Biconvex lenses are used as magnifiers, objectives, some condensing systems.
Since both surfaces contribute to the power of biconvex lenses, they have shorter focal lengths than PCX lenses of equal diameter and surface radius.
Under customers request lens are anti-reflection coated (please refer to the Coatings section).
Standard Specifications
| AR coatings |
None. |
| Design wavelength |
632.8 nm |
| Surface Quality |
40-20 scratch & dig |
| Surface Figure |
λ/4@632.8nm |
| Clear Aperture |
>90% |
| Centration |
<3 arc minutes |
| Diameter Tolerance |
+0.0, -0.15mm |
| Focal Length |
±3% |
|
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 |
|
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