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-BCC044
20.0000
-40.0000
-40.5000
1.50
3.6000
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L-BCC045
20.0000
-70.0000
-70.9000
2.00
3.3000
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L-BCC046
22.4000
-40.0000
-40.8000
2.00
4.9000
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L-BCC049
25.0000
-75.0000
-75.5000
1.50
3.5000
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L-BCC050
25.0000
-30.0000
-30.5000
1.50
6.7000
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L-BCC051
25.0000
-40.0000
-40.5000
1.50
5.3000
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L-BCC053
25.0000
-50.0000
-50.5000
1.50
4.5000
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L-BCC054
25.0000
-60.0000
-60.5000
1.50
4.1000
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L-BCC055
25.0000
-100.0000
-100.5000
1.50
3.1000
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L-BCC056
25.0000
-125.0000
-125.5000
1.50
2.7000
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L-BCC057
25.0000
-150.0000
-150.5000
1.50
2.5000
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L-BCC058
25.0000
-200.0000
-200.5000
1.50
2.3000
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L-BCC059
25.0000
-250.0000
-250.5000
1.50
2.1000
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L-BCC060
25.0000
-300.0000
-300.5000
1.50
2.1000
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L-BCC061
25.0000
-400.0000
-400.5000
1.50
1.9000
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L-BCC062
25.0000
-500.0000
-500.5000
1.50
1.9000
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L-BCC063
25.4000
-25.0000
-25.8000
2.50
7.7300
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L-BCC064
25.4000
-50.0000
-50.8000
2.50
5.0300
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L-BCC065
25.4000
-75.0000
-75.6000
2.50
4.1800
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L-BCC066
25.4000
-100.0000
-100.6000
2.50
3.7600
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L-BCC067
25.4000
-150.0000
-150.8000
2.50
3.3400
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L-BCC068
25.4000
-200.0000
-200.8000
2.50
3.1300
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L-BCC069
30.0000
-150.0000
-151.2000
2.00
3.4000
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L-BCC070
30.0000
-30.0000
-30.8000
2.00
9.4000
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L-BCC071
30.0000
-50.0000
-50.8000
2.00
6.3000
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L-BCC072
0.0000
0.0000
0.0000
0.0000
0.0000
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L-BCC073
30.0000
-100.0000
-101.0000
2.00
4.1000
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L-BCC074
30.0000
-200.0000
-201.4000
2.00
3.1000
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L-BCC085
38.1000
-50.0000
-50.8000
2.50
8.3000
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L-BCC086
38.1000
-75.0000
-75.6000
2.50
6.3100
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