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| MATERIAL | N-BK7 GRADE A OPTICAL GLASS |
| DIAMETER TOLERANCE | + 0.0 / – 0.1mm |
| THICKNESS TOLERANCE | ± 0.2mm |
| SURFACE QUALITY | 40/20 |
| CENTRATION | ≤ 3 arc MINS |
| FOCAL LENGTH | ± 1% |
| CUSTOM SIZES | |
| DIMENSIONS | DIAMETERS 1mm TO > 300mm |
| COATINGS | ANTI REFLECTION UV TO IR ON REQUEST |
| Part No. | Description | Diameter | Thickness | Focal Length | Unit Price | Quantity | |||
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| l20-004-010 | n-bk7 Plano concave | 4 | 1.5 | -10 | £19.00 |
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| l20-006-010 | n-bk7 Plano concave | 6.3 | 1.5 | -10 | £19.00 |
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| l20-006-012 | n-bk7 Plano concave | 6.3 | 1.5 | -12 | £19.00 |
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| l20-010-012 | n-bk7 Plano concave | 10 | 1.5 | -12.5 | £19.00 |
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| l20-010-016 | n-bk7 Plano concave | 10 | 1.5 | -16 | £19.00 |
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| l20-010-020 | n-bk7 Plano concave | 10 | 1.5 | -20 | £19.00 |
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| l20-010-025 | n-bk7 Plano concave | 10 | 1.5 | 25 | £19.00 |
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| l20-010-032 | n-bk7 Plano concave | 10 | 1.5 | -32 | £19.00 |
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| l20-010-050 | n-bk7 Plano concave | 10 | 1.5 | -50 | £19.00 |
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| l20-010-100 | n-bk7 Plano concave | 10 | 1.5 | -100 | £19.00 |
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| l20-025-025 | n-bk7 Plano concave | 25 | 2 | -25.4 | £21.50 |
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| l20-025-050 | n-bk7 Plano concave | 25 | 2 | -50 | £21.50 |
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| l20-025-100 | n-bk7 Plano concave | 25 | 2 | -100 | £21.50 |
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| l20-025-250 | n-bk7 Plano concave | 25 | 2 | -250 | £29.00 |
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| l20-025-500 | n-bk7 Plano concave | 25 | 2 | -500 | £23.50 |
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| l20-040-050 | n-bk7 Plano concave | 40 | 2.5 | -50 | £23.00 |
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| l20-040-100 | n-bk7 Plano concave | 40 | 2.5 | -100 | £23.00 |
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| l20-050-063 | n-bk7 Plano concave | 50 | 2.5 | -63 | £27.50 |
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| l20-050-100 | n-bk7 Plano concave | 50 | 2.5 | -100 | £27.50 |
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| l20-050-250 | n-bk7 Plano concave | 50 | 2.5 | -250 | £27.50 |
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| l20-050-500 | n-bk7 Plano concave | 50 | 2.5 | -500 | £27.50 |
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