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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.
  • We will provide precision grade bi-concave lenses with tighter manufacturing tolerances.
  • 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 +/-2%
Center thickness tolerance +/-0.2mm
Centration 3 arc min
Surface quality 60-40
Flange width 0.2-0.4mm

PN: DVS013
Description: Bi-concave lens, standard grade, D=20, EFL=-30
Material: BK7
EFL: -30
Diameter: 20
Index: 1.51872
BFL: -30.65
Tc: 2
Te: 5.26
Radius1: -31.461
Radius2: 31.4610826262922
Volume Price: $15.60 (MOQ Range Applies) Request Volume Quote

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