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-BCC126
95.0000
-150.0000
-151.5000
3.00
17.5000
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L-BCC105
50.0000
-50.0000
-50.8000
2.50
15.3000
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L-BCC107
50.0000
-75.0000
-75.8000
2.50
10.7000
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L-BCC125
76.2000
-150.0000
-150.8000
2.50
10.1500
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L-BCC092
40.0000
-50.0000
-50.5000
1.40
9.6000
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L-BCC070
30.0000
-30.0000
-30.8000
2.00
9.4000
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L-BCC025
50.8000
-75.0000
-75.6000
2.50
9.3500
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L-BCC085
38.1000
-50.0000
-50.8000
2.50
8.3000
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L-BCC013
25.0000
-25.0000
-25.7000
2.00
8.1000
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L-BCC108
50.0000
-100.0000
-101.0000
2.00
7.9000
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L-BCC063
25.4000
-25.0000
-25.8000
2.50
7.7300
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L-BCC119
50.8000
-100.0000
-100.6000
2.50
7.5900
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L-BCC109
50.0000
-125.0000
-125.8000
2.50
7.3000
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L-BCC042
20.0000
-20.0000
-20.7000
2.00
6.8000
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L-BCC050
25.0000
-30.0000
-30.5000
1.50
6.7000
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L-BCC086
38.1000
-75.0000
-75.6000
2.50
6.3100
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L-BCC071
30.0000
-50.0000
-50.8000
2.00
6.3000
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L-BCC093
40.0000
-100.0000
-100.7000
2.20
6.0000
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L-BCC110
50.0000
-150.0000
-151.2000
2.00
5.9000
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L-BCC120
50.8000
-150.0000
-150.8000
2.50
5.8800
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L-BCC087
38.1000
-100.0000
-100.6000
2.50
5.3500
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L-BCC124
63.5000
-300.0000
-300.6000
2.00
5.3000
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L-BCC051
25.0000
-40.0000
-40.5000
1.50
5.3000
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L-BCC010
20.0000
-30.0000
-30.7000
2.00
5.1000
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L-BCC027
12.7000
-12.5000
-13.3000
2.50
5.0700
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L-BCC064
25.4000
-50.0000
-50.8000
2.50
5.0300
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L-BCC121
50.8000
-200.0000
-200.8000
2.50
5.0300
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L-BCC112
50.0000
-250.0000
-250.8000
2.50
4.9000
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L-BCC111
50.0000
-200.0000
-201.4000
2.00
4.9000
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L-BCC046
22.4000
-40.0000
-40.8000
2.00
4.9000
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