The achromatic-doublet
consists of a positive low-index(crown) and a negative high-index(flint)lens.
These lenses are computer-optimized and exhibit excellent paraxial performance,
minimal spherical aberration, coma and smallest chromatic aberration.
Specifications
| Material |
Optical
crown and flint glasses or equivalent |
| Focal
Length Tolerance |
2% |
| Fringes
power |
1-5 |
| Fringes
Irregularity |
0.2-0.5
|
| Diameter
Tolerance |
0/-0.20
mm |
| Center
Thickness(Tc) Tolerance |
0/-0.25
mm |
| Centration
|
3
arc minutes |
| Clear
Aperture |
90%
of diameter |
| Surface
Quality: |
60-40
scratch and dig |
| Antireflection
Coating |
Single-layer
MgF2 AR Coateds |
Product list
| Product
No. |
Diameter
(mm)
|
Focal
Length f' (mm)
|
fb
|
Center
Thickness Tc (mm)
|
Edge
Thickness Te (mm)
|
| LAD061 |
6.0 |
10.0 |
7.8 |
4.2 |
3.0 |
| LAD062 |
6.0 |
20.0 |
18.6 |
3.1 |
2.5 |
| LAD063 |
6.0 |
30.0 |
28.8 |
2.8 |
2.4 |
| LAD101 |
10.0 |
20.0 |
17.0 |
5.0 |
3.4 |
| LAD102 |
10.0 |
30.0 |
28.2 |
3.7 |
2.7 |
| LAD121 |
12.7 |
50.0 |
48.1 |
4.3 |
3.3 |
| LAD122 |
12.7 |
75.0 |
73.3 |
3.8 |
3.1 |
| LAD201 |
20.0 |
40.0 |
35.5 |
8.5 |
5.4 |
| LAD202 |
20.0 |
50.0 |
46.4 |
7.4 |
4.9 |
| LAD203 |
20.0 |
60.0 |
56.8 |
6.7 |
4.6 |
| LAD251 |
25.4 |
100.0 |
96.4 |
7.7 |
5.7 |
| LAD252 |
25.4 |
150.0 |
147.1 |
6.5 |
5.2 |
| LAD253 |
25.4 |
200.0 |
197.3 |
6.1 |
5.1 |
| LAD301 |
30.0 |
50.0 |
42.3 |
13.5 |
7.7 |
| LAD302 |
30.0 |
75.0 |
69.7 |
9.9 |
6.2 |
| LAD303 |
30.0 |
90.0 |
85.7 |
8.8 |
5.8 |
| LAD381 |
38.1 |
150.0 |
145.2 |
10.3 |
7.4 |
| LAD382 |
38.1 |
200.0 |
195.8 |
9.0 |
6.8 |
| LAD383 |
38.1 |
300.0 |
296.3 |
8.0 |
6.5 |
| LAD401 |
40.0 |
120.0 |
114.2 |
12.1 |
6.7 |
| LAD402 |
40.0 |
250.0 |
246.1 |
8.6 |
6.7 |
| LAD501 |
50.8 |
400.0 |
395.5 |
9.7 |
7.8 |
| LAD502 |
50.8 |
500.0 |
495.5 |
9.0 |
7.5 |
Note:Any other
components is available upon request.
