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Symmetric concave lenses are manufactured with both concave surfaces. They have negative focal lengths. These lenses are often used to expand light or to increase focal lengths in existing systems. Also, they can be used in laser beam expander, optical characterreaders, viewers, and projection systems.
Focal Length:  |
| n: refractive index |
| R: radius curvature |
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| Material: |
BK7A |
| Focal Length Tolerance: |
¡À0.5% |
| Diameter Tolerance: |
+0/-0.2mm |
| Thickness Tolerance: |
¡À0.2mm |
| Surface Flatness: |
¦Ë/10 |
| Centration Error: |
<3 arcmin |
| Surface Quality: |
20/10 |
| Clear Aperture: |
>90% of central diameter |
| Coating: |
Optional |
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Product Number |
¦Õ |
f' 587.6 |
f'b |
tc |
te |
TBC-06B-010 |
6.0 |
-10.0 |
-10.7 |
2.0 |
2.9 |
TBC-08B-030 |
8.0 |
-30.0 |
-30.7 |
2.0 |
2.5 |
TBC-12.7B-50 |
12.7 |
-50.0 |
-50.7 |
2.0 |
2.8 |
TBC-12.7B-75 |
12.7 |
-75.0 |
-75.7 |
2.0 |
2.5 |
TBC-12.7B-100 |
12.7 |
-100.0 |
-100.7 |
2.0 |
2.4 |
TBC-12.7B-145 |
12.7 |
-145.0 |
-145.7 |
2.0 |
2.3 |
TBC-12.7B-220 |
12.7 |
-220.0 |
-220.7 |
2.0 |
2.2 |
TBC-12.7B-300 |
12.7 |
-300.0 |
-300.8 |
2.5 |
2.6 |
TBC-15B-030 |
15.0 |
-30.0 |
-30.7 |
2.0 |
3.8 |
TBC-20B-50 |
20.0 |
-50.0 |
-50.8 |
2.5 |
4.5 |
TBC-20B-75 |
20.0 |
-75.0 |
-75.8 |
2.5 |
3.8 |
TBC-20B-100 |
20.0 |
-100.0 |
-100.8 |
2.5 |
3.5 |
TBC-20B-145 |
20.0 |
-145.0 |
-145.8 |
2.5 |
3.2 |
TBC-20B-220 |
20.0 |
-220.0 |
-220.8 |
2.5 |
2.9 |
TBC-20B-300 |
20.0 |
-300.0 |
-300.8 |
2.5 |
2.8 |
TBC-25.4B-50 |
25.4 |
-50.0 |
-50.8 |
2.5 |
5.7 |
TBC-25.4B-25.4 |
25.4 |
-75.0 |
-75.8 |
2.5 |
4.6 |
TBC-25.4B-100 |
25.4 |
-100.0 |
-100.8 |
2.5 |
4.1 |
TBC-25.4B-145 |
25.4 |
-145.0 |
-145.8 |
2.5 |
3.6 |
TBC-25.4B-220 |
25.4 |
-220.0 |
-220.8 |
2.5 |
3.2 |
TBC-25.4B-300 |
25.4 |
-300.0 |
-300.8 |
2.5 |
3.0 |
TBC-38.1B-100 |
38.1 |
-100.0 |
-101.0 |
3.0 |
6.5 |
TBC-38.1B-145 |
38.1 |
-145.0 |
-146.0 |
3.0 |
5.4 |
TBC-38.1B-220 |
38.1 |
-220.0 |
-221.0 |
3.0 |
4.6 |
TBC-38.1B-300 |
38.1 |
-300.0 |
-301.0 |
3.0 |
4.2 |
TBC-50.8B-220 |
50.8 |
-220.0 |
-220.7 |
2.0 |
4.8 |
TBC-50.8B-300 |
50.8 |
-300.0 |
-301.3 |
4.0 |
6.1 |
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¡¤All dimensions are in mm unless otherwise specified.
¡¤Other size and AR coating are available upon request.
¡¤The material of UV Fused Silica is available. |
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