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-BCC000
6.3500
-12.5000
-13.3000
2.50
3.1200
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L-BCC001
5.0000
-5.0000
-5.6000
2.00
3.0000
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L-BCC004
6.0000
-8.0000
-8.6000
2.00
2.9000
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L-BCC005
6.3500
-6.2500
-7.0000
2.50
3.7500
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L-BCC007
12.0000
-12.0000
-12.7000
2.00
4.8000
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L-BCC008
12.7000
-25.0000
-25.8000
2.50
3.7500
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L-BCC009
12.7000
-50.0000
-50.8000
2.50
3.1200
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L-BCC010
20.0000
-30.0000
-30.7000
2.00
5.1000
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L-BCC011
12.5000
-15.0000
-15.5000
1.50
4.1000
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L-BCC012
12.5000
-20.0000
-20.5000
1.50
3.5000
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L-BCC013
25.0000
-25.0000
-25.7000
2.00
8.1000
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L-BCC014
12.5000
-25.0000
-25.5000
1.50
3.1000
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L-BCC015
12.5000
-30.0000
-30.5000
1.50
2.7000
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L-BCC016
12.5000
-35.0000
-35.5000
1.50
2.5000
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L-BCC017
12.5000
-40.0000
-40.5000
1.50
2.5000
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L-BCC018
12.5000
-50.0000
-50.5000
1.50
2.3000
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L-BCC019
12.5000
-60.0000
-60.5000
1.50
2.1000
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L-BCC020
12.5000
-75.0000
-75.5000
1.50
2.1000
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L-BCC021
12.5000
-100.0000
-100.5000
1.50
1.9000
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L-BCC022
12.5000
-125.0000
-125.5000
1.50
1.9000
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L-BCC023
12.5000
-150.0000
-150.5000
1.50
1.7000
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L-BCC024
12.5000
-200.0000
-200.5000
1.50
1.7000
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L-BCC025
50.8000
-75.0000
-75.6000
2.50
9.3500
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L-BCC026
12.5000
-250.0000
-250.5000
1.50
1.7000
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L-BCC027
12.7000
-12.5000
-13.3000
2.50
5.0700
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L-BCC028
12.7000
-75.0000
-75.6000
2.50
2.9200
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L-BCC029
12.7000
-100.0000
-100.6000
2.50
2.8100
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L-BCC030
13.0000
-30.0000
-30.8000
2.00
3.3000
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L-BCC042
20.0000
-20.0000
-20.7000
2.00
6.8000
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L-BCC043
20.0000
-35.0000
-35.8000
2.00
4.7000
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