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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
111-0104E 12.7 mm 4.8 mm 1.3 mm 12.3 mm 12.7 mm 18 $ 4 - 5 days
111-0108E 12.7 mm 3.5 mm 1.9 mm 25.3 mm 25 mm 18 $ 4 - 5 days
111-0114E 12.7 mm 2.5 mm 1.5 mm 41.1 mm 40 mm 18 $ 4 - 5 days
111-0116E 12.7 mm 2.5 mm 1.7 mm 51.4 mm 50 mm 18 $ 4 - 5 days
111-0118E 12.7 mm 2.5 mm 1.8 mm 61.8 mm 60 mm 18 $ Request
111-0120E 12.7 mm 2.5 mm 2 mm 77.4 mm 75 mm 17 $ 4 - 5 days
111-0124E 12.7 mm 2 mm 1.6 mm 103.4 mm 100 mm 17 $ 4 - 5 days
111-0128E 12.7 mm 2 mm 1.7 mm 129.3 mm 125 mm 17 $ 4 - 5 days
111-0132E 12.7 mm 2 mm 1.7 mm 155.3 mm 150 mm 17 $ Request
111-0136E 12.7 mm 2 mm 1.8 mm 207.1 mm 200 mm 17 $ 4 - 5 days
111-0140E 12.7 mm 2 mm 1.8 mm 259.0 mm 250 mm 17 $ 4 - 5 days
111-0144E 12.7 mm 2 mm 1.9 mm 310.9 mm 300 mm 17 $ 4 - 5 days
111-0148E 12.7 mm 2 mm 1.9 mm 414.6 mm 400 mm 17 $ 4 - 5 days
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
111-0204E 25.4 mm 9 mm 1.8 mm 24.3 mm 25 mm 23 $ 4 - 5 days
111-0206E 25.4 mm 7.5 mm 1.8 mm 29.8 mm 30 mm 23 $ 4 - 5 days
111-0208E 25.4 mm 6 mm 1.9 mm 40.4 mm 40 mm 23 $ 4 - 5 days
111-0210E 25.4 mm 6 mm 2.8 mm 50.8 mm 50 mm 21 $ 4 - 5 days
111-0214E 25.4 mm 4 mm 1.4 mm 61.6 mm 60 mm 21 $ 4 - 5 days
111-0216E 25.4 mm 4 mm 1.9 mm 77.1 mm 75 mm 21 $ 4 - 5 days
111-0218E 25.4 mm 4 mm 2.4 mm 103.1 mm 100 mm 19 $ 4 - 5 days
111-0222E 25.4 mm 4 mm 3 mm 154.9 mm 150 mm 19 $ 4 - 5 days
111-0226E 25.4 mm 4 mm 3.2 mm 206.8 mm 200 mm 19 $ 4 - 5 days
111-0228E 25.4 mm 4 mm 3.4 mm 258.7 mm 250 mm 19 $ 4 - 5 days
111-0229E 25.4 mm 4 mm 3.5 mm 310.5 mm 300 mm 19 $ 4 - 5 days
111-0234E 25.4 mm 4 mm 3.7 mm 518.0 mm 500 mm 19 $ 4 - 5 days
111-0240E 25.4 mm 4 mm 3.8 mm 725.5 mm 700 mm 19 $ 4 - 5 days
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
111-0404E 38.1 mm 10.5 mm 3 mm 50.0 mm 50 mm 34 $ Request
111-0410E 38.1 mm 6 mm 2.4 mm 102.7 mm 100 mm 34 $ 4 - 5 days
111-0414E 38.1 mm 5 mm 2.6 mm 154.8 mm 150 mm 34 $ Request
111-0418E 38.1 mm 5 mm 3.2 mm 206.6 mm 200 mm 34 $ Request
111-0422E 38.1 mm 5 mm 3.6 mm 258.5 mm 250 mm 34 $ Request
111-0426E 38.1 mm 5 mm 3.8 mm 310.4 mm 300 mm 34 $ Request
111-0430E 38.1 mm 5 mm 4.1 mm 414.1 mm 400 mm 34 $ Request
111-0434E 38.1 mm 5 mm 4.3 mm 517.9 mm 500 mm 33 $ Request
111-0440E 38.1 mm 5 mm 4.5 mm 725.4 mm 700 mm 33 $ Request
111-0450E 38.1 mm 5 mm 4.6 mm 1036.6 mm 1000 mm 33 $ Request
Size: dia 50.8 mm
Code Diameter CT ET ROC Focal Length Price Delivery Add to cart
111-0504E 50.8 mm 15 mm 0.9 mm 49.2 mm 50 mm 56 $ 4 - 5 days
111-0508E 50.8 mm 10 mm 1.3 mm 76.1 mm 75 mm 53 $ Request
111-0510E 50.8 mm 8.5 mm 2.1 mm 102.3 mm 100 mm 53 $ 4 - 5 days
111-0512E 50.8 mm 6.1 mm 1.9 mm 154.6 mm 150 mm 52 $ 4 - 5 days
111-0514E 50.8 mm 5 mm 1.9 mm 206.6 mm 200 mm 52 $ Request
111-0518E 50.8 mm 5 mm 2.9 mm 310.4 mm 300 mm 52 $ Request
111-0522E 50.8 mm 5 mm 3.4 mm 414.1 mm 400 mm 52 $ 4 - 5 days
111-0526E 50.8 mm 5 mm 3.8 mm 517.9 mm 500 mm 52 $ 4 - 5 days
111-0534E 50.8 mm 5 mm 4.2 mm 777.2 mm 750 mm 52 $ 4 - 5 days
111-0544E 50.8 mm 5 mm 4.4 mm 1036.6 mm 1000 mm 52 $ Request
111-0550E 50.8 mm 5 mm 4.5 mm 1244.1 mm 1200 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.