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Biconcave Lenses

Biconcave Lenses

The Biconcave Lenses are often used to expand light beams or to increase focal lengths in optical systems, and are normally used in combination with other lenses.

from 16 $
delivery Estimated delivery time: 4 - 5 days
Products
Specifications
Brochures
Description
Material
Diameter
Focal Length
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BK7, Size: dia 12.7 mm
Code Material Diameter CT ET ROC Focal Length Price Delivery Add to cart
114-0104E BK7 12.7 mm 3.2 mm 5 mm -13.7 mm -12.7 mm 17 $ 4 - 5 days
114-0106E BK7 12.7 mm 2.2 mm 3.2 mm -26.3 mm -25 mm 17 $ 4 - 5 days
114-0108E BK7 12.7 mm 2.4 mm 3.1 mm -41.9 mm -40 mm 17 $ 4 - 5 days
114-0110E BK7 12.7 mm 2.6 mm 3.1 mm -52.3 mm -50 mm 17 $ Request
114-0112E BK7 12.7 mm 2.6 mm 3 mm -62.7 mm -60 mm 17 $ 4 - 5 days
114-0114E BK7 12.7 mm 2.7 mm 3 mm -78.3 mm -75 mm 17 $ 4 - 5 days
114-0118E BK7 12.7 mm 2.8 mm 3 mm -104.2 mm -100 mm 17 $ Request
114-0120E BK7 12.7 mm 1.7 mm 2 mm -130.0 mm -125 mm 16 $ Request
114-0124E BK7 12.7 mm 1.8 mm 2 mm -155.9 mm -150 mm 16 $ 4 - 5 days
114-0128E BK7 12.7 mm 1.8 mm 2 mm -207.8 mm -200 mm 16 $ 4 - 5 days
114-0132E BK7 12.7 mm 1.8 mm 2 mm -259.7 mm -250 mm 16 $ Request
BK7, Size: dia 25.4 mm
Code Material Diameter CT ET ROC Focal Length Price Delivery Add to cart
114-0204E BK7 25.4 mm 4.8 mm 10.2 mm -26.7 mm -25 mm 21 $ 4 - 5 days
114-0206E BK7 25.4 mm 3 mm 6.5 mm -42.0 mm -40 mm 21 $ 4 - 5 days
114-0208E BK7 25.4 mm 4.5 mm 7.5 mm -52.6 mm -50 mm 21 $ 4 - 5 days
114-0210E BK7 25.4 mm 2.8 mm 5.2 mm 62.7 mm -60 mm 21 $ 4 - 5 days
114-0212E BK7 25.4 mm 3.7 mm 5.5 mm -78.4 mm -75 mm 20 $ 4 - 5 days
114-0214E BK7 25.4 mm 3.2 mm 4.6 mm -104.3 mm -100 mm 19 $ 4 - 5 days
114-0218E BK7 25.4 mm 3.1 mm 4.1 mm -130.2 mm -125 mm 19 $ 4 - 5 days
114-0220E BK7 25.4 mm 3 mm 4 mm -156.1 mm -150 mm 19 $ 4 - 5 days
114-0224E BK7 25.4 mm 2.8 mm 3.6 mm -208.0 mm -200 mm 19 $ 4 - 5 days
114-0228E BK7 25.4 mm 2.9 mm 3.5 mm -259.9 mm -250 mm 19 $ 4 - 5 days
114-0234E BK7 25.4 mm 3.2 mm 3.6 mm -415.5 mm -400 mm 19 $ 4 - 5 days
114-0238E BK7 25.4 mm 3.2 mm 3.5 mm -519.3 mm -500 mm 19 $ 4 - 5 days
UVFS, Size: dia 12.7 mm
Code Material Diameter CT ET ROC Focal Length Price Delivery Add to cart
114-1104E UVFS 12.7 mm 3.7 mm 6.7 mm -12.6 mm -12.7 mm 54 $ Request
114-1108E UVFS 12.7 mm 2.8 mm 4 mm -24.2 mm -25 mm 54 $ Request
114-1110E UVFS 12.7 mm 3 mm 4 mm -29.0 mm -30 mm 54 $ 4 - 5 days
114-1114E UVFS 12.7 mm 2.6 mm 3.2 mm -48.0 mm -50 mm 54 $ Request
114-1118E UVFS 12.7 mm 2.7 mm 3.1 mm -71.8 mm -75 mm 54 $ 4 - 5 days
114-1122E UVFS 12.7 mm 2.8 mm 3 mm -95.5 mm -100 mm 52 $ 4 - 5 days
UVFS, Size: dia 25.4 mm
Code Material Diameter CT ET ROC Focal Length Price Delivery Add to cart
114-1204E UVFS 25.4 mm 5.3 mm 12 mm -24.6 mm -25 mm 78 $ 4 - 5 days
114-1205E UVFS 25.4 mm 3 mm 7.5 mm -29.0 mm -30 mm 78 $ 4 - 5 days
114-1208E UVFS 25.4 mm 2.6 mm 6 mm -48.0 mm -50 mm 78 $ 4 - 5 days
114-1212E UVFS 25.4 mm 3.8 mm 6.1 mm -71.9 mm -75 mm 78 $ 4 - 5 days
114-1216E UVFS 25.4 mm 3.6 mm 5.3 mm -95.7 mm -100 mm 78 $ 4 - 5 days
114-1220E UVFS 25.4 mm 4.4 mm 5.3 mm -143.4 mm -150 mm 78 $ 4 - 5 days
114-1224E UVFS 25.4 mm 3 mm 3.8 mm -190.7 mm -200 mm 77 $ 4 - 5 days

 

Material BK7, UV FS
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:
   BK7
   UV FS


±2% @ 546 nm
±2% @ 355 nm

EKSMA Optics Biconcave Lenses
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  • Have negative focal lengths diverge collimated incident light
  • Form only virtual images which are seen through the lens
  • Minimize spherical aberration, coma and distortion at unit conjugate ratio  

These lenses are symmetrical with equal radii on both sides. The biconcave lenses are often used to expand light beams or to increase focal lengths in optical systems, and are normally used in combination with other lenses. Among the many devices utilising biconcave lenses are laser beam expanders, optical character readers, viewers and projection systems.

A variety of anti-reflection coatings is available for these lenses. For appropriate coating please refer to the COATINGS section. We can supply custom cutting, edging, coating or complete fabrication if required.