Bi-Concave-Model.jpg

Bi-Concave Lens

Bi-concave lenses have two inward curved surfaces. These lenses have a negative focal length. Our catalog bi-concave lenses have an identical curvature on both sides of the lens and are therefore symmetric. At unit conjugation, coma and distortion are cancelled out due to the symmetry. They are used to diverge incoming light or increase the focal length of an existing optical system.

Diameter Dia. Tolerance CT Tolerance Centering Irregularity Surface Quality Bevel
5.00-25.00 +0.00 / -0.10 ±0.1 < 3 minutes 0.5 Waves 40-20 0.25 x 45°
25.01 - 50.00 +0.00 / -0.10 ±0.1 < 3 minutes 0.5 Waves 60-40 0.50 x 45°
50.01-100.00 +0.00 / -0.10 ±0.1 < 3 minutes 0.5 Waves 60-40 0.50 x 45°
Dimensions MM
Clear Aperture CA >= 90% of Diameter
Flat Annulus Dia < 50 mm - Flat = 0.25 +0/-0.20
Dia > 50 mm - Flat = 0.50 +0/-0.40
Coating Uncoated, Specify your coating (See Coating Chart for Available Options)
Design Wavelength 587.6nm
Focal Length Tolerance ±2%
Edge Thickness Reference
* All dimensions are in mm
Viewing 1 to 30 (91 Total)
Sort by:
Part Number
Diameter
Effective Focal Length
Back Focal Length
Center Thickness
Edge Thickness
L-BCC118
50.0000
-1000.0000
-1000.8000
2.50
3.1000
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L-BCC117
50.0000
-750.0000
-750.8000
2.50
3.3000
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L-BCC116
50.0000
-600.0000
-603.0000
2.00
3.0000
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L-BCC062
25.0000
-500.0000
-500.5000
1.50
1.9000
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L-BCC115
50.0000
-500.0000
-500.8000
2.50
3.7000
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L-BCC091
38.1000
-500.0000
-500.9000
2.50
3.0600
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L-BCC123
50.8000
-500.0000
-501.0000
2.50
3.5100
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L-BCC061
25.0000
-400.0000
-400.5000
1.50
1.9000
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L-BCC114
50.0000
-400.0000
-400.8000
2.50
4.1000
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L-BCC124
63.5000
-300.0000
-300.6000
2.00
5.3000
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L-BCC060
25.0000
-300.0000
-300.5000
1.50
2.1000
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L-BCC113
50.0000
-300.0000
-300.8000
2.50
4.5000
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L-BCC096
40.0000
-250.0000
-250.6000
1.90
3.5000
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L-BCC090
38.1000
-250.0000
-250.6000
2.50
3.6300
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L-BCC059
25.0000
-250.0000
-250.5000
1.50
2.1000
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L-BCC112
50.0000
-250.0000
-250.8000
2.50
4.9000
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L-BCC122
50.8000
-250.0000
-250.6000
2.50
4.5200
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L-BCC026
12.5000
-250.0000
-250.5000
1.50
1.7000
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L-BCC095
40.0000
-200.0000
-200.7000
2.20
4.1000
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L-BCC089
38.1000
-200.0000
-200.8000
2.50
3.9200
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L-BCC058
25.0000
-200.0000
-200.5000
1.50
2.3000
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L-BCC074
30.0000
-200.0000
-201.4000
2.00
3.1000
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L-BCC111
50.0000
-200.0000
-201.4000
2.00
4.9000
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L-BCC121
50.8000
-200.0000
-200.8000
2.50
5.0300
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L-BCC068
25.4000
-200.0000
-200.8000
2.50
3.1300
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L-BCC024
12.5000
-200.0000
-200.5000
1.50
1.7000
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L-BCC023
12.5000
-150.0000
-150.5000
1.50
1.7000
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L-BCC125
76.2000
-150.0000
-150.8000
2.50
10.1500
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L-BCC094
40.0000
-150.0000
-150.7000
2.10
4.6000
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L-BCC126
95.0000
-150.0000
-151.5000
3.00
17.5000
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