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BK7 Biconvex Lenses

BK7 Biconvex Lenses

Biconvex lenses, made of BK7, are all symmetrical. They are recommended for virtual imaging of real objects, and for positive conjugate ratios from 0.2 up to 5.

from 17 $
delivery Estimated delivery time: 4 - 5 days
Products
Specifications
Brochures
Description
Diameter
CT
ET
ROC
Focal Length
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Size: dia 12.7 mm
Code Diameter CT ET ROC Focal Length Price Delivery Add to cart
i 111-0104E 12.7 mm 4.8 mm 1.3 mm 12.3 mm 12.7 mm 18 $ 4 - 5 days
i 111-0108E 12.7 mm 3.5 mm 1.9 mm 25.3 mm 25 mm 18 $ 4 - 5 days
i 111-0114E 12.7 mm 2.5 mm 1.5 mm 41.1 mm 40 mm 18 $ 4 - 5 days
i 111-0116E 12.7 mm 2.5 mm 1.7 mm 51.4 mm 50 mm 18 $ 4 - 5 days
i 111-0118E 12.7 mm 2.5 mm 1.8 mm 61.8 mm 60 mm 18 $ 4 - 5 days
i 111-0120E 12.7 mm 2.5 mm 2 mm 77.4 mm 75 mm 17 $ 4 - 5 days
i 111-0124E 12.7 mm 2 mm 1.6 mm 103.4 mm 100 mm 17 $ 4 - 5 days
i 111-0128E 12.7 mm 2 mm 1.7 mm 129.3 mm 125 mm 17 $ Request
i 111-0132E 12.7 mm 2 mm 1.7 mm 155.3 mm 150 mm 17 $ 4 - 5 days
i 111-0136E 12.7 mm 2 mm 1.8 mm 207.1 mm 200 mm 17 $ 4 - 5 days
i 111-0140E 12.7 mm 2 mm 1.8 mm 259.0 mm 250 mm 17 $ 4 - 5 days
i 111-0144E 12.7 mm 2 mm 1.9 mm 310.9 mm 300 mm 17 $ 4 - 5 days
i 111-0148E 12.7 mm 2 mm 1.9 mm 414.6 mm 400 mm 17 $ 4 - 5 days
i 111-0152E 12.7 mm 3 mm 2.9 mm 518.2 mm 500 mm 17 $ 4 - 5 days
Size: dia 25.4 mm
Code Diameter CT ET ROC Focal Length Price Delivery Add to cart
i 111-0204E 25.4 mm 9 mm 1.8 mm 24.3 mm 25 mm 23 $ Request
i 111-0206E 25.4 mm 7.5 mm 1.8 mm 29.8 mm 30 mm 23 $ 4 - 5 days
i 111-0208E 25.4 mm 6 mm 1.9 mm 40.4 mm 40 mm 23 $ 4 - 5 days
i 111-0210E 25.4 mm 6 mm 2.8 mm 50.8 mm 50 mm 21 $ 4 - 5 days
i 111-0214E 25.4 mm 4 mm 1.4 mm 61.6 mm 60 mm 21 $ 4 - 5 days
i 111-0216E 25.4 mm 4 mm 1.9 mm 77.1 mm 75 mm 21 $ 4 - 5 days
i 111-0218E 25.4 mm 4 mm 2.4 mm 103.1 mm 100 mm 19 $ 4 - 5 days
i 111-0222E 25.4 mm 4 mm 3 mm 154.9 mm 150 mm 19 $ 4 - 5 days
i 111-0226E 25.4 mm 4 mm 3.2 mm 206.8 mm 200 mm 19 $ 4 - 5 days
i 111-0228E 25.4 mm 4 mm 3.4 mm 258.7 mm 250 mm 19 $ 4 - 5 days
i 111-0229E 25.4 mm 4 mm 3.5 mm 310.5 mm 300 mm 19 $ 4 - 5 days
i 111-0234E 25.4 mm 4 mm 3.7 mm 518.0 mm 500 mm 19 $ 4 - 5 days
i 111-0240E 25.4 mm 4 mm 3.8 mm 725.5 mm 700 mm 19 $ Request
i 111-0250E 25.4 mm 4 mm 3.8 mm 1036.8 mm 1000 mm 19 $ 4 - 5 days
Size: dia 38.1 mm
Code Diameter CT ET ROC Focal Length Price Delivery Add to cart
i 111-0404E 38.1 mm 10.5 mm 3 mm 50.0 mm 50 mm 34 $ 4 - 5 days
i 111-0410E 38.1 mm 6 mm 2.4 mm 102.7 mm 100 mm 34 $ 4 - 5 days
i 111-0414E 38.1 mm 5 mm 2.6 mm 154.8 mm 150 mm 34 $ Request
i 111-0418E 38.1 mm 5 mm 3.2 mm 206.6 mm 200 mm 34 $ 4 - 5 days
i 111-0422E 38.1 mm 5 mm 3.6 mm 258.5 mm 250 mm 34 $ Request
i 111-0426E 38.1 mm 5 mm 3.8 mm 310.4 mm 300 mm 34 $ 4 - 5 days
i 111-0430E 38.1 mm 5 mm 4.1 mm 414.1 mm 400 mm 34 $ Request
i 111-0434E 38.1 mm 5 mm 4.3 mm 517.9 mm 500 mm 33 $ 4 - 5 days
i 111-0440E 38.1 mm 5 mm 4.5 mm 725.4 mm 700 mm 33 $ Request
i 111-0450E 38.1 mm 5 mm 4.6 mm 1036.6 mm 1000 mm 33 $ 4 - 5 days
Size: dia 50.8 mm
Code Diameter CT ET ROC Focal Length Price Delivery Add to cart
i 111-0504E 50.8 mm 15.6 mm 1.4 mm 49.1 mm 50 mm 56 $ 4 - 5 days
i 111-0508E 50.8 mm 10 mm 1.3 mm 76.1 mm 75 mm 53 $ 4 - 5 days
i 111-0510E 50.8 mm 8.5 mm 2.1 mm 102.3 mm 100 mm 53 $ 4 - 5 days
i 111-0512E 50.8 mm 6.1 mm 1.9 mm 154.6 mm 150 mm 52 $ 4 - 5 days
i 111-0514E 50.8 mm 5 mm 1.9 mm 206.6 mm 200 mm 52 $ 4 - 5 days
i 111-0518E 50.8 mm 5 mm 2.9 mm 310.4 mm 300 mm 52 $ 4 - 5 days
i 111-0522E 50.8 mm 5 mm 3.4 mm 414.1 mm 400 mm 52 $ 4 - 5 days
i 111-0526E 50.8 mm 5 mm 3.8 mm 517.9 mm 500 mm 52 $ Request
i 111-0534E 50.8 mm 5 mm 4.2 mm 777.2 mm 750 mm 52 $ 4 - 5 days
i 111-0544E 50.8 mm 5 mm 4.4 mm 1036.6 mm 1000 mm 52 $ 4 - 5 days
i 111-0550E 50.8 mm 5 mm 4.5 mm 1244.1 mm 1200 mm 52 $ 4 - 5 days
i 111-0555E 50.8 mm 5 mm 4.6 mm 1555.3 mm 1500 mm 52 $ 4 - 5 days

Material BK7
Surface quality 40-20 scratch & dig (MIL-PRF-13830B)
Clear aperture 90% of the diameter
Diameter tolerance +0.00, -0.12 mm
Thickness tolerance ±0.5 mm
Surface irregularity λ/8 @ 633 nm
Concentricity 3 arcmin
Paraxial focal length ±2% @ 546 nm

EKSMA Optics BK7 Biconvex Lenses
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  • Have positive focal lengths
  • Converge incident light
  • Form both real and virtual images
  • Minimize spherical aberration as well as cancel coma and distortion at unit conjugate ratio

Biconvex lenses are all symmetrical, having equal radii on both sides. They are recommended for virtual imaging of real objects, and for positive conjugate ratios from 0.2 up to 5. Outside of this ratios range plano-convex lenses are usually more suitable. Biconvex lenses are used as magnifiers, objectives, some condensing systems.

Since both surfaces contribute to the power of biconvex lenses, they have shorter focal lengths than plano-convex lenses of equal diameter and surface radius. Lenses may be anti-reflection coated.

For required coating please refer to the COATINGS section. We can supply custom cutting, edging, coating or complete fabrication if required.