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Achromats

achromats

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.

 

STANDARD TOLERANCES

EFL: +/- 2%

CT: +/- 0.1

Diameter: +0.0 – 0.1

Surface Accuracy: 2 ½ X 1 Fringe

Scratch/Dig: 60-40

TIA: 1’

Standard Coating: MgF2

Achromats

 

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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