Negative Achromats consist of two optical components, a crown and a flint glass lens, cemented together. The crown is usually a bi-concave lens. As is true to all Achromats, they are corrected for color and on-axis spherical aberration. They are used predominantly to extend focal lengths in combination with positive achromatic systems or CCD lenses.
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| Diameter | Dia. Tolerance | CT Tolerance | Centering | Irregularity | Surface Quality | Bevel |
| 6.00-25.00 | +0.00 / -0.10 | ±0.2 | < 3 minutes | 0.50 Waves | 40-20 | 0.25 x 45° |
| 25.01 - 50.00 | +0.00 / -0.10 | ±0.2 | < 3 minutes | 0.50 Waves | 60-40 | 0.50 x 45° |
| Dimensions | MM | |||||
| Clear Aperture | CA >= 90% of Diameter | |||||
| Coating | 1/4wave MgF2 @ 550nm (See Coating Chart for Available Options) | |||||
| Design Wavelength | 587.6nm | |||||
| Focal Length Tolerance | ±2% | |||||
| Edge Thickness | Reference | |||||
| * All dimensions are in mm | ||||||
| Part Number | Diameter | EFL | BFL | CT | ET | |
|---|---|---|---|---|---|---|
| L-AON012 | 31.5 | -100 | -103.8 | 7.8 | 10.7 | Add to Quote |
| L-AON009 | 26.4 | -109 | -111.7 | 6.25 | 8.15 | Add to Quote |
| L-AON008 | 25.4 | -125 | -128.2 | 5.75 | 7.3 | Add to Quote |
| L-AON006 | 18 | -50 | -52.4 | 4.7 | 6.6 | Add to Quote |
| L-AON005 | 10 | -25 | -26.5 | 3.25 | 4.45 | Add to Quote |
| L-AON004 | 10 | -20 | -21 | 3.5 | 4.95 | Add to Quote |
| L-AON003 | 8 | -20 | -21.3 | 2.8 | 3.6 | Add to Quote |
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