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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
Size: dia 12,7 mm
Code Focal Length Centre Thickness Edge Thickness Diameter Price Delivery Add to cart
111-0104E F 12,7 mm CT - 4,8 mm ET - 1,2 mm 12,7 mm 18 $ 4 - 5 days
111-0108E F 25 mm CT - 3,5 mm ET - 1,9 mm 12,7 mm 18 $ 4 - 5 days
111-0114E F 40 mm CT - 2,5 mm ET - 2 mm 12,7 mm 18 $ 4 - 5 days
111-0116E F 50 mm CT - 2,5 mm ET - 2 mm 12,7 mm 18 $ 4 - 5 days
111-0118E F 60 mm CT - 2,5 mm ET - 2 mm 12,7 mm 18 $ 4 - 5 days
111-0120E F 75 mm CT - 2,5 mm ET - 2 mm 12,7 mm 17 $ 4 - 5 days
111-0124E F 100 mm CT - 2 mm ET - 1,6 mm 12,7 mm 17 $ 4 - 5 days
111-0128E F 125 mm CT - 2 mm ET - 1,7 mm 12,7 mm 17 $ 4 - 5 days
111-0132E F 150 mm CT - 2 mm ET - 1,7 mm 12,7 mm 17 $ Request
111-0132M F 150 mm CT - 2 mm ET - 1,7 mm 12,5 mm 17 $ 4 - 5 days
111-0136E F 200 mm CT - 2 mm ET - 1,9 mm 12,7 mm 17 $ 4 - 5 days
111-0140E F 250 mm CT - 2 mm ET - 1,9 mm 12,7 mm 17 $ 4 - 5 days
111-0144E F 300 mm CT - 2 mm ET - 1,9 mm 12,7 mm 17 $ 4 - 5 days
111-0148E F 400 mm CT - 2 mm ET - 1,9 mm 12,7 mm 17 $ 4 - 5 days
111-0152E F 500 mm CT - 3 mm ET - 3 mm 12,7 mm 17 $ 4 - 5 days
Size: dia 25,4 mm
Code Focal Length Centre Thickness Edge Thickness Diameter Price Delivery Add to cart
111-0204E F 25 mm CT - 9 mm ET - 2,1 mm 25,4 mm 23 $ 4 - 5 days
111-0206E F 30 mm CT - 7,5 mm ET - 2,4 mm 25,4 mm 23 $ 4 - 5 days
111-0208E F 40 mm CT - 6 mm ET - 3 mm 25,4 mm 23 $ 4 - 5 days
111-0210E F 50 mm CT - 6 mm ET - 3 mm 25,4 mm 21 $ 4 - 5 days
111-0214E F 60 mm CT - 4 mm ET - 1,6 mm 25,4 mm 21 $ 4 - 5 days
111-0216E F 75 mm CT - 4 mm ET - 2 mm 25,4 mm 21 $ 4 - 5 days
111-0218E F 100 mm CT - 4 mm ET - 2,5 mm 25,4 mm 19 $ 4 - 5 days
111-0222E F 150 mm CT - 4 mm ET - 3 mm 25,4 mm 19 $ 4 - 5 days
111-0226E F 200 mm CT - 4 mm ET - 3,2 mm 25,4 mm 19 $ Request
111-0228E F 250 mm CT - 4 mm ET - 3,4 mm 25,4 mm 19 $ 4 - 5 days
111-0229E F 300 mm CT - 4 mm ET - 3,5 mm 25,4 mm 19 $ 4 - 5 days
111-0234E F 500 mm CT - 4 mm ET - 3,7 mm 25,4 mm 19 $ 4 - 5 days
111-0240E F 700 mm CT - 4 mm ET - 3,8 mm 25,4 mm 19 $ 4 - 5 days
111-0250E F 1000mm CT - 4 mm ET - 3,8 mm 25,4 mm 19 $ 4 - 5 days
Size: dia 38,1 mm
Code Focal Length Centre Thickness Edge Thickness Diameter Price Delivery Add to cart
111-0404E F 50 mm CT-10,5mm ET - 2,2 mm 38,1 mm 34 $ Request
111-0410E F 100 mm CT - 6 mm ET - 2 mm 38,1 mm 34 $ 4 - 5 days
111-0414E F 150 mm CT - 5 mm ET - 2,6 mm 38,1 mm 34 $ Request
111-0418E F 200 mm CT - 5 mm ET - 3 mm 38,1 mm 34 $ Request
111-0422E F 250 mm CT - 5 mm ET - 3,4 mm 38,1 mm 34 $ Request
111-0426E F 300 mm CT - 5 mm ET - 3,7 mm 38,1 mm 34 $ Request
111-0430E F 400 mm CT - 5 mm ET - 4 mm 38,1 mm 34 $ Request
111-0434E F 500 mm CT - 5 mm ET - 4,2 mm 38,1 mm 33 $ Request
111-0440E F 700 mm CT - 5 mm ET - 4,5 mm 38,1 mm 33 $ Request
111-0450E F 1000mm CT - 5 mm ET - 4,6 mm 38,1 mm 33 $ Request
Size: dia 50,8 mm
Code Focal Length Centre Thickness Edge Thickness Diameter Price Delivery Add to cart
111-0504E F 50 mm CT - 15 mm ET - 1,5 mm 50,8 mm 56 $ 4 - 5 days
111-0508E F 75 mm CT - 10 mm ET - 2 mm 50,8 mm 53 $ Request
111-0510E F 100 mm CT - 8,5 mm ET - 2 mm 50,8 mm 53 $ 4 - 5 days
111-0512E F 150 mm CT - 6,1 mm ET - 2 mm 50,8 mm 52 $ 4 - 5 days
111-0514E F 200 mm CT - 5 mm ET - 2 mm 50,8 mm 52 $ Request
111-0518E F 300 mm CT - 5 mm ET - 3 mm 50,8 mm 52 $ Request
111-0518M F 300 mm CT - 5 mm ET - 3 mm 50,0 mm 52 $ 4 - 5 days
111-0522E F 400 mm CT - 5 mm ET - 3,6 mm 50,8 mm 52 $ 4 - 5 days
111-0526E F 500 mm CT - 5 mm ET - 4 mm 50,8 mm 52 $ 4 - 5 days
111-0534E F 750 mm CT - 5 mm ET - 3,4 mm 50,8 mm 52 $ 4 - 5 days
111-0544E F 1000mm CT - 5 mm ET - 4,4 mm 50,8 mm 52 $ Request
111-0550E F 1200mm CT - 5 mm ET - 4,5 mm 50,8 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
644.88 kB
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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.