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Bi-concave glass lenses are manufactured with both surfaces concave. These lenses have negative focal lengths.

  • These lenses diverge collimated incident light and form virtual images, which are seen through the lens.
  • They are often used to expand light or increase focal lengths in existing systems.
  • They are used in laser beam expanders, optical character readers, viewers, and projection systems.
  • Antireflection coatings can be ordered as an option.
  • Minimum Order Quantity (MOQ) ranging from 100 to 1,000 units.

General Specifications:

Parameter Value
Default unit mm
Material BK7
Diameter tolerance +0, -0.1mm
Focal length tolerance +/-1%
Center thickness tolerance +/-0.2mm
Centration 3 arc min
Surface quality 20-10
Flange width 0.2-0.4mm

PN: DVP023
Description: Bi-concave lens, precision grade, D=20, EFL=-70
Material: BK7
EFL: -70
Diameter: 20
Index: 1.51872
BFL: -70.70
Tc: 2
Te: 3.30
Radius1: -72.961
Radius2: 72.961
Volume Price: $22.20 (MOQ Range Applies) Request Volume Quote

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