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These achromatic triplets consist of a low-index, symmetrical convex crown glass elements which are cemented between two identical high-index meniscus flint glass elements. These lenses are reversible because they are symmetrical. |
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| Material £º |
Optical Crown and Flint |
| Focal Length Tolerance: |
¡À2% |
| Diameter Tolerance: |
+0/-0.1mm |
| Thickness Tolerance: |
¡À0.2mm |
| Surface Flatness: |
¦Ë/4 |
| Centration Error: |
<3 arcmin |
| Surface Quality: |
40/20 |
| Clear Aperture: |
>90% of central diameter |
| Coating: |
uncoated |
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Product Number |
f' |
f'b |
¦Õ |
tc |
Material |
TAT-30-4x |
60.97 |
53.11 |
30.0 |
22.4 |
F2+BK7+F2 |
TAT-27-6x |
43.42 |
35.82 |
26.5 |
21.0 |
F2+BK7+F2 |
TAT-18-8x |
31.63 |
25.88 |
18.0 |
15.8 |
F2+BK7+F2 |
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