Westech produces achromatic lenses or achromats, which are designed to limit the effects of chromatic and spherical aberrations. Achromats are corrected to bring two different wavelengths of light into focus within the same image plane.
The most common type is the achromatic doublet, consisting of two glass lenses. Typically, one lens is a negative flint glass, and the other is a positive crown element. The lenses are usually cemented together and are available in diameters from 5.0mm to 125.0mm.
Westech also produces air-spaced doublets which offer better control over chromatic and spherical aberrations than do cemented achromats, these require mounting in a barrel, using a spacer to maintain the central airspace.
Positive Achromats
Westech achromats are available in focal lengths from 10.0mm to 500mm. MgF2 coating is standard. BBAR and other custom coatings are always available. Minimum purchase quantities may apply to these orders. Contact us for details.
Negative Achromats
These lenses are primarily used to increase the focal length of other lenses or lens systems (Barlow Lens) or to expand a light source. Westech can provide any EFL or diameter in a variety of glass types and housings.
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STANDARD TOLERANCES |
EFL: +/- 2% |
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CT: +/- 0.1 |
Diameter: +0.0 – 0.1 |
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Surface Accuracy: 2 ½ X 1 Fringe |
Scratch/Dig: 60-40 |
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TIA: 1’ |
Standard Coating: MgF2 |
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| Diameter | EFL | P/N |
| 5.00 | 10.00 | 7625 NR |
| 5.00 | 15.00 | 7630 NR |
| 5.00 | 20.00 | 7635 NR |
| 10.00 | 20.00 | 7640 NR |
| 10.00 | 25.00 | 7205 NR |
| 12.50 | 20.00 | 7987 NR |
| 12.50 | 25.00 | 7988 NR |
| 12.50 | 30.00 | 7435 NR |
| 12.50 | 35.00 | 7989 NR |
| 12.50 | 40.00 | 7990 NR |
| 12.70 | 50.00 | 7230 NR |
| 15.00 | 25.00 | 7645 NR |
| 15.00 | 30.00 | 7650 NR |
| 15.00 | 40.00 | 7655 NR |
| 15.00 | 50.00 | 7660 NR |
| 20.00 | 30.00 | 7991 NR |
| 20.00 | 40.00 | 7665 NR |
| 25.00 | 50.00 | 7670 NR |
| 25.00 | 60.00 | 7675 NR |
| 25.00 | 65.00 | 7215 NR |
| 25.00 | 75.00 | 7615 NR |
| 25.00 | 100.00 | 7195 NR |
| 25.00 | 125.00 | 7680 NR |
| 30.00 | 60.00 | 7685 NR |
| 30.00 | 80.00 | 7690 NR |
| 30.00 | 100.00 | 7695 NR |
| 30.00 | 125.00 | 7992 NR |
| 30.00 | 150.00 | 7700 NR |
| 31.50 | 80.00 | 7375 NR |
| 40.00 | 60.00 | 7705 NR |
| 40.00 | 100.00 | 7710 NR |
| 40.00 | 120.00 | 7610 NR |
| 40.00 | 160.00 | 7715 NR |
| 50.00 | 100.00 | 7720 NR |
| 50.00 | 120.00 | 7725 NR |
| 50.00 | 150.00 | 7730 NR |
| 50.00 | 160.00 | 7735 NR |
| 50.00 | 200.00 | 7740 NR |
| 50.00 | 250.00 | 7745 NR |
| 75.00 | 200.00 | 7750 NR |
| 75.00 | 250.00 | 7755 NR |
| 75.00 | 300.00 | 7760 NR |
| 75.00 | 400.00 | 7765 NR |
| 75.00 | 500.00 | 7770 NR |