Spherical Lenses
BK7 Plano-Concave LensesPlano-Concave Lens has a negative focal length, and is useful for expanding light or increasing focal length in optics systems. Metal housing, standard and broadband antireflection coatings are available upon request, see our standard optics components below.
Specifications
| Parameter | Precision | Standard |
| Diameter Tolerance: | +0/-0.05mm | +0/-0.1mm |
| Center Thickness Tolerance: | +/-0.05mm | +/-0.1mm |
| Focal Length Tolerance: | +/-1% | +/-1% |
| Surface Figure at 632.8 nm(over 90% diameter): | λ /8 | λ /4 |
| Centration: | < 2 arc min . | < 3 arc min |
| Surface Quality: | 20-10 | 40-20 |
| Clear Aperture: | > 90% | > 90% |
| Coating: | custom | Custom |
BK7 Plano-Concave Lenses
| Diameter | Focal Length | Material | Center Thickness | Edge Thickness | Part No. | |
| Φ(mm) | f (mm) | name | Tc(mm) | Te(mm) | Precision | Standard |
| 6.00 | -12.00 | BK7 | 2.23 | 3.00 | KPWP 001 | KPWS 001 |
| 6.00 | -18.00 | BK7 | 2.50 | 3.00 | KPWP 002 | KPWS 002 |
| 6.00 | -24.00 | BK7 | 2.63 | 3.00 | KPWP 003 | KPWS 003 |
| 6.35 | -6.35 | BK7 | 1.00 | 3.00 | KPWP 004 | KPWS 004 |
| 6.35 | -12.70 | BK7 | 2.18 | 3.00 | KPWP 005 | KPWS 005 |
| 6.35 | -25.40 | BK7 | 2.61 | 3.00 | KPWP 006 | KPWS 006 |
| 10.00 | -20.00 | BK7 | 1.71 | 3.00 | KPWP 007 | KPWS 007 |
| 10.00 | -50.00 | BK7 | 2.51 | 3.00 | KPWP 008 | KPWS 008 |
| 12.70 | -19.05 | BK7 | 1.68 | 4.00 | KPWP 009 | KPWS 009 |
| 12.70 | -25.40 | BK7 | 1.36 | 3.00 | KPWP 010 | KPWS 010 |
| 12.70 | -30.00 | BK7 | 1.63 | 3.00 | KPWP 011 | KPWS 011 |
| 12.70 | -38.10 | BK7 | 1.95 | 3.00 | KPWP 012 | KPWS 012 |
| 12.70 | -50.00 | BK7 | 2.21 | 3.00 | KPWP 013 | KPWS 013 |
| 12.70 | -75.00 | BK7 | 2.48 | 3.00 | KPWP 014 | KPWS 014 |
| 12.70 | -100.00 | BK7 | 2.61 | 3.00 | KPWP 015 | KPWS 015 |
| 12.70 | -300.00 | BK7 | 2.87 | 3.00 | KPWP 016 | KPWS 016 |
| 20.00 | -30.00 | BK7 | 1.84 | 5.50 | KPWP 017 | KPWS 017 |
| 20.00 | -40.00 | BK7 | 1.42 | 4.00 | KPWP 018 | KPWS 018 |
| 20.00 | -50.00 | BK7 | 1.99 | 4.00 | KPWP 019 | KPWS 019 |
| 20.00 | -75.00 | BK7 | 2.69 | 4.00 | KPWP 020 | KPWS 020 |
| 20.00 | -100.00 | BK7 | 3.02 | 4.00 | KPWP 021 | KPWS 021 |
| 20.00 | -125.00 | BK7 | 3.22 | 4.00 | KPWP 022 | KPWS 022 |
| 20.00 | -150.00 | BK7 | 3.35 | 4.00 | KPWP 023 | KPWS 023 |
| 20.00 | -200.00 | BK7 | 3.52 | 4.00 | KPWP 024 | KPWS 024 |
| 20.00 | -250.00 | BK7 | 3.61 | 4.00 | KPWP 025 | KPWS 025 |
| 20.00 | -500.00 | BK7 | 3.81 | 4.00 | KPWP 026 | KPWS 026 |
| 20.00 | -1741.49 | BK7 | 3.94 | 4.00 | KPWP 027 | KPWS 027 |
| 20.00 | -1934.98 | BK7 | 3.95 | 4.00 | KPWP 028 | KPWS 028 |
| 20.00 | -2902.48 | BK7 | 3.97 | 4.00 | KPWP 029 | KPWS 029 |
| 20.00 | -3869.97 | BK7 | 3.97 | 4.00 | KPWP 030 | KPWS 030 |
| 20.00 | -5804.95 | BK7 | 3.98 | 4.00 | KPWP 031 | KPWS 031 |
| 20.00 | -9674.92 | BK7 | 3.99 | 4.00 | KPWP 032 | KPWS 032 |
| 22.00 | -40.00 | BK7 | 1.83 | 5.00 | KPWP 033 | KPWS 033 |
| 22.00 | -50.00 | BK7 | 2.54 | 5.00 | KPWP 034 | KPWS 034 |
| 22.00 | -85.00 | BK7 | 3.60 | 5.00 | KPWP 035 | KPWS 035 |
| 22.00 | -100.00 | BK7 | 3.82 | 5.00 | KPWP 036 | KPWS 036 |
| 22.00 | -150.00 | BK7 | 4.22 | 5.00 | KPWP 037 | KPWS 037 |
| 25.00 | -25.00 | BK7 | 2.35 | 12.00 | KPWP 038 | KPWS 038 |
| 25.00 | -50.00 | BK7 | 2.78 | 6.00 | KPWP 039 | KPWS 039 |
| 25.00 | -100.00 | BK7 | 2.47 | 4.00 | KPWP 040 | KPWS 040 |
| 25.40 | -38.10 | BK7 | 2.36 | 7.00 | KPWP 041 | KPWS 041 |
| 25.40 | -75.00 | BK7 | 2.86 | 5.00 | KPWP 042 | KPWS 042 |
| 25.40 | -150.00 | BK7 | 3.95 | 5.00 | KPWP 043 | KPWS 043 |
| 25.40 | -200.00 | BK7 | 4.22 | 5.00 | KPWP 044 | KPWS 044 |
| 30.00 | -50.00 | BK7 | 2.20 | 7.00 | KPWP 045 | KPWS 045 |
| 30.00 | -100.00 | BK7 | 2.78 | 5.00 | KPWP 046 | KPWS 046 |
| 30.00 | -125.00 | BK7 | 3.23 | 5.00 | KPWP 047 | KPWS 047 |
| 30.00 | -150.00 | BK7 | 3.53 | 5.00 | KPWP 048 | KPWS 048 |
| 30.00 | -200.00 | BK7 | 3.91 | 5.00 | KPWP 049 | KPWS 049 |
| 30.00 | -300.00 | BK7 | 4.27 | 5.00 | KPWP 050 | KPWS 050 |
| 30.00 | -400.00 | BK7 | 4.46 | 5.00 | KPWP 051 | KPWS 051 |
| 30.00 | -500.00 | BK7 | 4.56 | 5.00 | KPWP 052 | KPWS 052 |
| 30.00 | -1000.00 | BK7 | 4.78 | 5.00 | KPWP 053 | KPWS 053 |
| 40.00 | -50.00 | BK7 | 3.00 | 12.00 | KPWP 054 | KPWS 054 |
| 40.00 | -63.50 | BK7 | 3.00 | 9.00 | KPWP 055 | KPWS 055 |
| 40.00 | -100.00 | BK7 | 3.00 | 7.00 | KPWP 056 | KPWS 056 |
| 40.00 | -300.00 | BK7 | 3.70 | 5.00 | KPWP 057 | KPWS 057 |
| 40.00 | -500.00 | BK7 | 4.22 | 5.00 | KPWP 058 | KPWS 058 |
| 50.80 | -75.00 | BK7 | 4.00 | 12.00 | KPWP 059 | KPWS 059 |
| 50.80 | -100.00 | BK7 | 3.33 | 10.00 | KPWP 060 | KPWS 060 |
| 50.80 | -125.00 | BK7 | 4.00 | 8.50 | KPWP 061 | KPWS 061 |
| 50.80 | -150.00 | BK7 | 4.00 | 8.00 | KPWP 062 | KPWS 062 |
| 50.80 | -200.00 | BK7 | 4.00 | 7.00 | KPWP 063 | KPWS 063 |
| 50.80 | -250.00 | BK7 | 3.48 | 6.00 | KPWP 064 | KPWS 064 |
| 50.80 | -500.00 | BK7 | 4.75 | 6.00 | KPWP 065 | KPWS 065 |
| 50.80 | -600.00 | BK7 | 4.96 | 6.00 | KPWP 066 | KPWS 066 |
| 76.20 | -762.00 | BK7 | 6.15 | 8.00 | KPWP 067 | KPWS 067 |
| 76.20 | -1270.00 | BK7 | 6.89 | 8.00 | KPWP 068 | KPWS 068 |