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 31 to 60 (91 Total)
Sort by:
Part Number
Diameter
Effective Focal Length
Back Focal Length
Center Thickness
Edge Thickness
L-BCC007
12.0000
-12.0000
-12.7000
2.00
4.8000
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L-BCC043
20.0000
-35.0000
-35.8000
2.00
4.7000
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L-BCC094
40.0000
-150.0000
-150.7000
2.10
4.6000
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L-BCC122
50.8000
-250.0000
-250.6000
2.50
4.5200
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L-BCC053
25.0000
-50.0000
-50.5000
1.50
4.5000
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L-BCC113
50.0000
-300.0000
-300.8000
2.50
4.5000
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L-BCC088
38.1000
-150.0000
-150.8000
2.50
4.3900
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L-BCC065
25.4000
-75.0000
-75.6000
2.50
4.1800
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L-BCC054
25.0000
-60.0000
-60.5000
1.50
4.1000
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L-BCC095
40.0000
-200.0000
-200.7000
2.20
4.1000
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L-BCC114
50.0000
-400.0000
-400.8000
2.50
4.1000
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L-BCC011
12.5000
-15.0000
-15.5000
1.50
4.1000
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L-BCC073
30.0000
-100.0000
-101.0000
2.00
4.1000
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L-BCC089
38.1000
-200.0000
-200.8000
2.50
3.9200
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L-BCC066
25.4000
-100.0000
-100.6000
2.50
3.7600
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L-BCC005
6.3500
-6.2500
-7.0000
2.50
3.7500
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L-BCC008
12.7000
-25.0000
-25.8000
2.50
3.7500
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L-BCC115
50.0000
-500.0000
-500.8000
2.50
3.7000
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L-BCC090
38.1000
-250.0000
-250.6000
2.50
3.6300
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L-BCC044
20.0000
-40.0000
-40.5000
1.50
3.6000
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L-BCC123
50.8000
-500.0000
-501.0000
2.50
3.5100
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L-BCC049
25.0000
-75.0000
-75.5000
1.50
3.5000
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L-BCC096
40.0000
-250.0000
-250.6000
1.90
3.5000
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L-BCC012
12.5000
-20.0000
-20.5000
1.50
3.5000
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L-BCC069
30.0000
-150.0000
-151.2000
2.00
3.4000
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L-BCC067
25.4000
-150.0000
-150.8000
2.50
3.3400
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L-BCC030
13.0000
-30.0000
-30.8000
2.00
3.3000
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L-BCC045
20.0000
-70.0000
-70.9000
2.00
3.3000
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L-BCC117
50.0000
-750.0000
-750.8000
2.50
3.3000
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L-BCC068
25.4000
-200.0000
-200.8000
2.50
3.1300
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