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-BCC088
38.1000
-150.0000
-150.8000
2.50
4.3900
rfq_spacer
L-BCC057
25.0000
-150.0000
-150.5000
1.50
2.5000
rfq_spacer
L-BCC069
30.0000
-150.0000
-151.2000
2.00
3.4000
rfq_spacer
L-BCC110
50.0000
-150.0000
-151.2000
2.00
5.9000
rfq_spacer
L-BCC120
50.8000
-150.0000
-150.8000
2.50
5.8800
rfq_spacer
L-BCC067
25.4000
-150.0000
-150.8000
2.50
3.3400
rfq_spacer
L-BCC022
12.5000
-125.0000
-125.5000
1.50
1.9000
rfq_spacer
L-BCC056
25.0000
-125.0000
-125.5000
1.50
2.7000
rfq_spacer
L-BCC109
50.0000
-125.0000
-125.8000
2.50
7.3000
rfq_spacer
L-BCC066
25.4000
-100.0000
-100.6000
2.50
3.7600
rfq_spacer
L-BCC021
12.5000
-100.0000
-100.5000
1.50
1.9000
rfq_spacer
L-BCC093
40.0000
-100.0000
-100.7000
2.20
6.0000
rfq_spacer
L-BCC029
12.7000
-100.0000
-100.6000
2.50
2.8100
rfq_spacer
L-BCC087
38.1000
-100.0000
-100.6000
2.50
5.3500
rfq_spacer
L-BCC073
30.0000
-100.0000
-101.0000
2.00
4.1000
rfq_spacer
L-BCC119
50.8000
-100.0000
-100.6000
2.50
7.5900
rfq_spacer
L-BCC055
25.0000
-100.0000
-100.5000
1.50
3.1000
rfq_spacer
L-BCC108
50.0000
-100.0000
-101.0000
2.00
7.9000
rfq_spacer
L-BCC049
25.0000
-75.0000
-75.5000
1.50
3.5000
rfq_spacer
L-BCC107
50.0000
-75.0000
-75.8000
2.50
10.7000
rfq_spacer
L-BCC065
25.4000
-75.0000
-75.6000
2.50
4.1800
rfq_spacer
L-BCC020
12.5000
-75.0000
-75.5000
1.50
2.1000
rfq_spacer
L-BCC028
12.7000
-75.0000
-75.6000
2.50
2.9200
rfq_spacer
L-BCC086
38.1000
-75.0000
-75.6000
2.50
6.3100
rfq_spacer
L-BCC025
50.8000
-75.0000
-75.6000
2.50
9.3500
rfq_spacer
L-BCC045
20.0000
-70.0000
-70.9000
2.00
3.3000
rfq_spacer
L-BCC054
25.0000
-60.0000
-60.5000
1.50
4.1000
rfq_spacer
L-BCC019
12.5000
-60.0000
-60.5000
1.50
2.1000
rfq_spacer
L-BCC105
50.0000
-50.0000
-50.8000
2.50
15.3000
rfq_spacer
L-BCC053
25.0000
-50.0000
-50.5000
1.50
4.5000
rfq_spacer